397957923 has 48 divisors (see below), whose sum is σ = 655855200. Its totient is φ = 230307840.

The previous prime is 397957897. The next prime is 397957949. The reversal of 397957923 is 329759793.

It is an interprime number because it is at equal distance from previous prime (397957897) and next prime (397957949).

It is not a de Polignac number, because 397957923 - 2¹⁰ = 397956899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 397957923.

It is not an unprimeable number, because it can be changed into a prime (397957123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 277773 + ... + 279201.

It is an arithmetic number, because the mean of its divisors is an integer number (13663650).

Almost surely, 2^397957923 is an apocalyptic number.

397957923 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

397957923 is a deficient number, since it is larger than the sum of its proper divisors (257897277).

397957923 is a wasteful number, since it uses less digits than its factorization.

397957923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572 (or 1569 counting only the distinct ones).

The product of its digits is 3214890, while the sum is 54.

The square root of 397957923 is about 19948.8827506705. The cubic root of 397957923 is about 735.5503139489.

The spelling of 397957923 in words is "three hundred ninety-seven million, nine hundred fifty-seven thousand, nine hundred twenty-three".