399216730896 has 75 divisors (see below), whose sum is σ = 1155514878903. Its totient is φ = 133064661600.

The previous prime is 399216730837. The next prime is 399216730961. The reversal of 399216730896 is 698037612993.

The square root of 399216730896 is 631836.

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

399216730896 is a `hidden beast` number, since 399 + 2 + 167 + 3 + 0 + 89 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 22737321 + ... + 22754871.

Almost surely, 2^399216730896 is an apocalyptic number.

399216730896 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

399216730896 is the 631836-th square number.

It is an amenable number.

399216730896 is an abundant number, since it is smaller than the sum of its proper divisors (756298148007).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399216730896 is an frugal number, since it uses more digits than its factorization.

399216730896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35122 (or 17556 counting only the distinct ones).

The product of its (nonzero) digits is 26453952, while the sum is 63.

The spelling of 399216730896 in words is "three hundred ninety-nine billion, two hundred sixteen million, seven hundred thirty thousand, eight hundred ninety-six".