399161764 has 6 divisors (see below), whose sum is σ = 698533094. Its totient is φ = 199580880.

The previous prime is 399161759. The next prime is 399161767. The reversal of 399161764 is 467161993.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 382515364 + 16646400 = 19558^2 + 4080^2 .

It is a super-2 number, since 2×399161764² = 318660227679183392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399161767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49895217 + ... + 49895224.

Almost surely, 2^399161764 is an apocalyptic number.

It is an amenable number.

399161764 is a deficient number, since it is larger than the sum of its proper divisors (299371330).

399161764 is a wasteful number, since it uses less digits than its factorization.

399161764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99790445 (or 99790443 counting only the distinct ones).

The product of its digits is 244944, while the sum is 46.

The square root of 399161764 is about 19979.0331097378. The cubic root of 399161764 is about 736.2912584841.

The spelling of 399161764 in words is "three hundred ninety-nine million, one hundred sixty-one thousand, seven hundred sixty-four".