399985413136 has 45 divisors (see below), whose sum is σ = 793629302781. Its totient is φ = 195288588096.

The previous prime is 399985413119. The next prime is 399985413143. The reversal of 399985413136 is 631314589993.

The square root of 399985413136 is 632444.

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., 319247600400 + 80737812736 = 565020^2 + 284144^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 108778530 + ... + 108782206.

Almost surely, 2^399985413136 is an apocalyptic number.

399985413136 is the 632444-th square number.

It is an amenable number.

399985413136 is a deficient number, since it is larger than the sum of its proper divisors (393643889645).

399985413136 is an frugal number, since it uses more digits than its factorization.

399985413136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7448 (or 3722 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 61.

The spelling of 399985413136 in words is "three hundred ninety-nine billion, nine hundred eighty-five million, four hundred thirteen thousand, one hundred thirty-six".