397637668 has 36 divisors (see below), whose sum is σ = 725852820. Its totient is φ = 190449792.

The previous prime is 397637657. The next prime is 397637693. The reversal of 397637668 is 866736793.

It can be written as a sum of positive squares in 6 ways, for example, as 5280804 + 392356864 = 2298^2 + 19808^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2532646 + ... + 2532802.

Almost surely, 2^397637668 is an apocalyptic number.

It is an amenable number.

397637668 is a deficient number, since it is larger than the sum of its proper divisors (328215152).

397637668 is a wasteful number, since it uses less digits than its factorization.

397637668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464 (or 305 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 55.

The square root of 397637668 is about 19940.8542444901. The cubic root of 397637668 is about 735.3529506348.

The spelling of 397637668 in words is "three hundred ninety-seven million, six hundred thirty-seven thousand, six hundred sixty-eight".