399081776 has 20 divisors (see below), whose sum is σ = 813917400. Its totient is φ = 189038592.

The previous prime is 399081769. The next prime is 399081799. The reversal of 399081776 is 677180993.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656081 + ... + 656688.

It is an arithmetic number, because the mean of its divisors is an integer number (40695870).

Almost surely, 2^399081776 is an apocalyptic number.

It is an amenable number.

399081776 is an abundant number, since it is smaller than the sum of its proper divisors (414835624).

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

399081776 is a wasteful number, since it uses less digits than its factorization.

399081776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312796 (or 1312790 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 399081776 is about 19977.0312108681. The cubic root of 399081776 is about 736.2420734127.

The spelling of 399081776 in words is "three hundred ninety-nine million, eighty-one thousand, seven hundred seventy-six".