399049943616 has 63 divisors (see below), whose sum is σ = 1143848070313. Its totient is φ = 133011594240.

The previous prime is 399049943603. The next prime is 399049943623. The reversal of 399049943616 is 616349940993.

The square root of 399049943616 is 631704.

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

399049943616 is a `hidden beast` number, since 3 + 9 + 9 + 0 + 4 + 9 + 9 + 4 + 3 + 616 = 666.

It can be written as a sum of positive squares in only one way, i.e., 375161150016 + 23888793600 = 612504^2 + 154560^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15147736 + ... + 15174056.

Almost surely, 2^399049943616 is an apocalyptic number.

399049943616 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

399049943616 is the 631704-th square number.

It is an amenable number.

399049943616 is an abundant number, since it is smaller than the sum of its proper divisors (744798126697).

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

399049943616 is an frugal number, since it uses more digits than its factorization.

399049943616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52660 (or 26326 counting only the distinct ones).

The product of its (nonzero) digits is 34012224, while the sum is 63.

The spelling of 399049943616 in words is "three hundred ninety-nine billion, forty-nine million, nine hundred forty-three thousand, six hundred sixteen".