399664958 has 32 divisors (see below), whose sum is σ = 771545088. Its totient is φ = 150688800.

The previous prime is 399664931. The next prime is 399664973. The reversal of 399664958 is 859466993.

It is a junction number, because it is equal to n+sod(n) for n = 399664897 and 399664906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37085 + ... + 46632.

It is an arithmetic number, because the mean of its divisors is an integer number (24110784).

Almost surely, 2^399664958 is an apocalyptic number.

399664958 is a deficient number, since it is larger than the sum of its proper divisors (371880130).

399664958 is a wasteful number, since it uses less digits than its factorization.

399664958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83768.

The product of its digits is 12597120, while the sum is 59.

The square root of 399664958 is about 19991.6221953097. The cubic root of 399664958 is about 736.6005247178.

The spelling of 399664958 in words is "three hundred ninety-nine million, six hundred sixty-four thousand, nine hundred fifty-eight".