399699599524 has 9 divisors (see below), whose sum is σ = 699476511937. Its totient is φ = 199849167544.

The previous prime is 399699599503. The next prime is 399699599599. The reversal of 399699599524 is 425995996993.

The square root of 399699599524 is 632218.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 318793485924 + 80906113600 = 564618^2 + 284440^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1106382 + ... + 1422490.

Almost surely, 2^399699599524 is an apocalyptic number.

399699599524 is the 632218-th square number.

It is an amenable number.

399699599524 is a deficient number, since it is larger than the sum of its proper divisors (299776912413).

399699599524 is an frugal number, since it uses more digits than its factorization.

399699599524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632222 (or 316111 counting only the distinct ones).

The product of its digits is 1913187600, while the sum is 79.

The spelling of 399699599524 in words is "three hundred ninety-nine billion, six hundred ninety-nine million, five hundred ninety-nine thousand, five hundred twenty-four".