399336915029056 has 21 divisors (see below), whose sum is σ = 792434507997639. Its totient is φ = 199668377580864.

The previous prime is 399336915028981. The next prime is 399336915029071. The reversal of 399336915029056 is 650920519633993.

It is a happy number.

The square root of 399336915029056 is 19983416.

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

It is a super-2 number, since 2×399336915029056² (a number of 30 digits) contains 22 as substring.

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, 158618365 + ... + 161116291.

Almost surely, 2^{399336915029056} is an apocalyptic number.

399336915029056 is the 19983416-th square number.

It is an amenable number.

399336915029056 is a deficient number, since it is larger than the sum of its proper divisors (393097592968583).

399336915029056 is an frugal number, since it uses more digits than its factorization.

399336915029056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4995866 (or 2497929 counting only the distinct ones).

The product of its (nonzero) digits is 318864600, while the sum is 70.

The spelling of 399336915029056 in words is "three hundred ninety-nine trillion, three hundred thirty-six billion, nine hundred fifteen million, twenty-nine thousand, fifty-six".