399540964 has 6 divisors (see below), whose sum is σ = 699196694. Its totient is φ = 199770480.

The previous prime is 399540959. The next prime is 399540983. The reversal of 399540964 is 469045993.

It can be written as a sum of positive squares in only one way, i.e., 280294564 + 119246400 = 16742^2 + 10920^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49942617 + ... + 49942624.

Almost surely, 2^399540964 is an apocalyptic number.

It is an amenable number.

399540964 is a deficient number, since it is larger than the sum of its proper divisors (299655730).

399540964 is a wasteful number, since it uses less digits than its factorization.

399540964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99885245 (or 99885243 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 49.

The square root of 399540964 is about 19988.5208057025. The cubic root of 399540964 is about 736.5243413292.

The spelling of 399540964 in words is "three hundred ninety-nine million, five hundred forty thousand, nine hundred sixty-four".