397507925 has 6 divisors (see below), whose sum is σ = 492909858. Its totient is φ = 318006320.

The previous prime is 397507883. The next prime is 397507927. The reversal of 397507925 is 529705793.

It can be written as a sum of positive squares in 3 ways, for example, as 8708401 + 388799524 = 2951^2 + 19718^2 .

It is a de Polignac number, because none of the positive numbers 2^k-397507925 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 397507925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397507927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7950134 + ... + 7950183.

It is an arithmetic number, because the mean of its divisors is an integer number (82151643).

Almost surely, 2^397507925 is an apocalyptic number.

It is an amenable number.

397507925 is a deficient number, since it is larger than the sum of its proper divisors (95401933).

397507925 is a wasteful number, since it uses less digits than its factorization.

397507925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15900327 (or 15900322 counting only the distinct ones).

The product of its (nonzero) digits is 595350, while the sum is 47.

The square root of 397507925 is about 19937.6007834443. The cubic root of 397507925 is about 735.2729638495.

The spelling of 397507925 in words is "three hundred ninety-seven million, five hundred seven thousand, nine hundred twenty-five".