399451028 has 24 divisors (see below), whose sum is σ = 747230400. Its totient is φ = 186380480.

The previous prime is 399450967. The next prime is 399451049. The reversal of 399451028 is 820154993.

It is a super-2 number, since 2×399451028² = 319122247540513568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49178 + ... + 56721.

It is an arithmetic number, because the mean of its divisors is an integer number (31134600).

Almost surely, 2^399451028 is an apocalyptic number.

It is an amenable number.

399451028 is a deficient number, since it is larger than the sum of its proper divisors (347779372).

399451028 is a wasteful number, since it uses less digits than its factorization.

399451028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105967 (or 105965 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 399451028 is about 19986.2709878556. The cubic root of 399451028 is about 736.4690737180.

The spelling of 399451028 in words is "three hundred ninety-nine million, four hundred fifty-one thousand, twenty-eight".