397897625 has 16 divisors (see below), whose sum is σ = 497821584. Its totient is φ = 317520000.

The previous prime is 397897607. The next prime is 397897691. The reversal of 397897625 is 526798793.

It can be written as a sum of positive squares in 8 ways, for example, as 316555264 + 81342361 = 17792^2 + 9019^2 .

It is not a de Polignac number, because 397897625 - 2¹⁰ = 397896601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48845 + ... + 56405.

It is an arithmetic number, because the mean of its divisors is an integer number (31113849).

Almost surely, 2^397897625 is an apocalyptic number.

It is an amenable number.

397897625 is a deficient number, since it is larger than the sum of its proper divisors (99923959).

397897625 is an equidigital number, since it uses as much as digits as its factorization.

397897625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7997 (or 7987 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 56.

The square root of 397897625 is about 19947.3713807108. The cubic root of 397897625 is about 735.5131622380.

The spelling of 397897625 in words is "three hundred ninety-seven million, eight hundred ninety-seven thousand, six hundred twenty-five".