397749608 has 8 divisors (see below), whose sum is σ = 745780530. Its totient is φ = 198874800.

The previous prime is 397749607. The next prime is 397749631. The reversal of 397749608 is 806947793.

It can be written as a sum of positive squares in only one way, i.e., 232318564 + 165431044 = 15242^2 + 12862^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 397749608.

It is not an unprimeable number, because it can be changed into a prime (397749601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24859343 + ... + 24859358.

Almost surely, 2^397749608 is an apocalyptic number.

It is an amenable number.

397749608 is a deficient number, since it is larger than the sum of its proper divisors (348030922).

397749608 is a wasteful number, since it uses less digits than its factorization.

397749608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49718707 (or 49718703 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 397749608 is about 19943.6608474974. The cubic root of 397749608 is about 735.4219478592.

The spelling of 397749608 in words is "three hundred ninety-seven million, seven hundred forty-nine thousand, six hundred eight".