399045636 has 48 divisors (see below), whose sum is σ = 1128617280. Its totient is φ = 120922560.

The previous prime is 399045617. The next prime is 399045637. The reversal of 399045636 is 636540993.

It is a happy number.

399045636 is a `hidden beast` number, since 3 + 9 + 9 + 0 + 4 + 5 + 636 = 666.

It is a super-2 number, since 2×399045636² = 318474839221288992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 399045591 and 399045600.

It is not an unprimeable number, because it can be changed into a prime (399045637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166761 + ... + 169136.

It is an arithmetic number, because the mean of its divisors is an integer number (23512860).

Almost surely, 2^399045636 is an apocalyptic number.

399045636 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

399045636 is an abundant number, since it is smaller than the sum of its proper divisors (729571644).

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

399045636 is a wasteful number, since it uses less digits than its factorization.

399045636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335921 (or 335913 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 45.

The square root of 399045636 is about 19976.1266515809. The cubic root of 399045636 is about 736.2198485677.

The spelling of 399045636 in words is "three hundred ninety-nine million, forty-five thousand, six hundred thirty-six".