399953968 has 20 divisors (see below), whose sum is σ = 820494360. Its totient is φ = 188213504.

The previous prime is 399953963. The next prime is 399953977. The reversal of 399953968 is 869359993.

It is not an unprimeable number, because it can be changed into a prime (399953963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734938 + ... + 735481.

It is an arithmetic number, because the mean of its divisors is an integer number (41024718).

Almost surely, 2^399953968 is an apocalyptic number.

It is an amenable number.

399953968 is an abundant number, since it is smaller than the sum of its proper divisors (420540392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399953968 is a wasteful number, since it uses less digits than its factorization.

399953968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470444 (or 1470438 counting only the distinct ones).

The product of its digits is 14171760, while the sum is 61.

The square root of 399953968 is about 19998.8491668896. The cubic root of 399953968 is about 736.7780347541.

The spelling of 399953968 in words is "three hundred ninety-nine million, nine hundred fifty-three thousand, nine hundred sixty-eight".