399790077 has 32 divisors (see below), whose sum is σ = 581644800. Its totient is φ = 243427392.

The previous prime is 399790073. The next prime is 399790087. The reversal of 399790077 is 770097993.

It is not a de Polignac number, because 399790077 - 2² = 399790073 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399790073) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177118 + ... + 179360.

It is an arithmetic number, because the mean of its divisors is an integer number (18176400).

Almost surely, 2^399790077 is an apocalyptic number.

It is an amenable number.

399790077 is a deficient number, since it is larger than the sum of its proper divisors (181854723).

399790077 is a wasteful number, since it uses less digits than its factorization.

399790077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377.

The product of its (nonzero) digits is 750141, while the sum is 51.

The square root of 399790077 is about 19994.7512362620. The cubic root of 399790077 is about 736.6773833493.

The spelling of 399790077 in words is "three hundred ninety-nine million, seven hundred ninety thousand, seventy-seven".