397840964 has 6 divisors (see below), whose sum is σ = 696221694. Its totient is φ = 198920480.

The previous prime is 397840957. The next prime is 397840979. The reversal of 397840964 is 469048793.

It can be written as a sum of positive squares in only one way, i.e., 272580100 + 125260864 = 16510^2 + 11192^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49730117 + ... + 49730124.

It is an arithmetic number, because the mean of its divisors is an integer number (116036949).

Almost surely, 2^397840964 is an apocalyptic number.

It is an amenable number.

397840964 is a deficient number, since it is larger than the sum of its proper divisors (298380730).

397840964 is a wasteful number, since it uses less digits than its factorization.

397840964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99460245 (or 99460243 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 397840964 is about 19945.9510678233. The cubic root of 397840964 is about 735.4782479896.

The spelling of 397840964 in words is "three hundred ninety-seven million, eight hundred forty thousand, nine hundred sixty-four".