399049964 has 6 divisors (see below), whose sum is σ = 698337444. Its totient is φ = 199524980.

The previous prime is 399049961. The next prime is 399049967. The reversal of 399049964 is 469940993.

It is an interprime number because it is at equal distance from previous prime (399049961) and next prime (399049967).

It is not an unprimeable number, because it can be changed into a prime (399049961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49881242 + ... + 49881249.

It is an arithmetic number, because the mean of its divisors is an integer number (116389574).

Almost surely, 2^399049964 is an apocalyptic number.

It is an amenable number.

399049964 is a deficient number, since it is larger than the sum of its proper divisors (299287480).

399049964 is a wasteful number, since it uses less digits than its factorization.

399049964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99762495 (or 99762493 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 53.

The square root of 399049964 is about 19976.2349805963. The cubic root of 399049964 is about 736.2225102082. Note that the first 3 decimals are identical.

The spelling of 399049964 in words is "three hundred ninety-nine million, forty-nine thousand, nine hundred sixty-four".