397832915 has 4 divisors (see below), whose sum is σ = 477399504. Its totient is φ = 318266328.

The previous prime is 397832899. The next prime is 397832921. The reversal of 397832915 is 519238793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 519238793 = 107 ⋅4852699.

It is a cyclic number.

It is not a de Polignac number, because 397832915 - 2⁴ = 397832899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 397832915.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39783287 + ... + 39783296.

It is an arithmetic number, because the mean of its divisors is an integer number (119349876).

Almost surely, 2^397832915 is an apocalyptic number.

397832915 is a deficient number, since it is larger than the sum of its proper divisors (79566589).

397832915 is an equidigital number, since it uses as much as digits as its factorization.

397832915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79566588.

The product of its digits is 408240, while the sum is 47.

The square root of 397832915 is about 19945.7492965293. The cubic root of 397832915 is about 735.4732879638.

The spelling of 397832915 in words is "three hundred ninety-seven million, eight hundred thirty-two thousand, nine hundred fifteen".