397497725 has 6 divisors (see below), whose sum is σ = 492897210. Its totient is φ = 317998160.

The previous prime is 397497713. The next prime is 397497739. The reversal of 397497725 is 527794793.

It can be written as a sum of positive squares in 3 ways, for example, as 11689561 + 385808164 = 3419^2 + 19642^2 .

It is a de Polignac number, because none of the positive numbers 2^k-397497725 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7949930 + ... + 7949979.

It is an arithmetic number, because the mean of its divisors is an integer number (82149535).

Almost surely, 2^397497725 is an apocalyptic number.

It is an amenable number.

397497725 is a deficient number, since it is larger than the sum of its proper divisors (95399485).

397497725 is a wasteful number, since it uses less digits than its factorization.

397497725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15899919 (or 15899914 counting only the distinct ones).

The product of its digits is 3333960, while the sum is 53.

The square root of 397497725 is about 19937.3449837234. The cubic root of 397497725 is about 735.2666747938.

It can be divided in two parts, 39749 and 7725, that added together give a palindrome (47474).

The spelling of 397497725 in words is "three hundred ninety-seven million, four hundred ninety-seven thousand, seven hundred twenty-five".