399049965 has 24 divisors (see below), whose sum is σ = 696279168. Its totient is φ = 211413600.

The previous prime is 399049961. The next prime is 399049967. The reversal of 399049965 is 569940993.

399049965 is a `hidden beast` number, since 3 + 9 + 90 + 499 + 65 = 666.

It is not a de Polignac number, because 399049965 - 2² = 399049961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399049961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22569 + ... + 36158.

It is an arithmetic number, because the mean of its divisors is an integer number (29011632).

Almost surely, 2^399049965 is an apocalyptic number.

It is an amenable number.

399049965 is a deficient number, since it is larger than the sum of its proper divisors (297229203).

399049965 is a wasteful number, since it uses less digits than its factorization.

399049965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58889 (or 58886 counting only the distinct ones).

The product of its (nonzero) digits is 2361960, while the sum is 54.

The square root of 399049965 is about 19976.2350056261. The cubic root of 399049965 is about 736.2225108231. Note that the first 3 decimals are identical.

The spelling of 399049965 in words is "three hundred ninety-nine million, forty-nine thousand, nine hundred sixty-five".