399388628 has 12 divisors (see below), whose sum is σ = 705462912. Its totient is φ = 197827800.

The previous prime is 399388597. The next prime is 399388637. The reversal of 399388628 is 826883993.

It is a super-2 number, since 2×399388628² = 319022552351444768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466148 + ... + 467003.

It is an arithmetic number, because the mean of its divisors is an integer number (58788576).

Almost surely, 2^399388628 is an apocalyptic number.

It is an amenable number.

399388628 is a deficient number, since it is larger than the sum of its proper divisors (306074284).

399388628 is a wasteful number, since it uses less digits than its factorization.

399388628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933262 (or 933260 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 56.

The square root of 399388628 is about 19984.7098552869. The cubic root of 399388628 is about 736.4307226977.

The spelling of 399388628 in words is "three hundred ninety-nine million, three hundred eighty-eight thousand, six hundred twenty-eight".