# 397

## 397 is a prime number. Like all primes greater than two, it is odd and has no factors apart from itself and one.

What does the number 397 look like?

As a prime, it is not composed of any other numbers and has no internal structure.

397 is a prime number. Like all primes (except two), it is an odd number.

## Prime factorization of 397:

### 397

See below for interesting mathematical facts about the number 397 from the Numbermatics database.

### Names of 397

• Cardinal: 397 can be written as Three hundred ninety-seven.

### Scientific notation

• Scientific notation: 3.97 × 102

### Factors of 397

• Number of distinct prime factors ω(n): 1
• Total number of prime factors Ω(n): 1
• Sum of prime factors: 397

### Divisors of 397

• Number of divisors d(n): 2
• Complete list of divisors:
• Sum of all divisors σ(n): 398
• Sum of proper divisors (its aliquot sum) s(n): 1
• 397 is a deficient number, because the sum of its proper divisors (1) is less than itself. Its deficiency is 396

### Bases of 397

• Binary: 1100011012
• Base-36: B1

### Squares and roots of 397

• 397 squared (3972) is 157609
• 397 cubed (3973) is 62570773
• The square root of 397 is 19.9248588451
• The cube root of 397 is 7.3495965965

### Scales and comparisons

How big is 397?
• 397 seconds is equal to 6 minutes, 37 seconds.
• To count from 1 to 397 would take you about three minutes.

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 397 cubic inches would be around 0.6 feet tall.

### Recreational maths with 397

• 397 backwards is 793
• The number of decimal digits it has is: 3
• The sum of 397's digits is 19
• More coming soon!