399451492 has 72 divisors (see below), whose sum is σ = 805575680. Its totient is φ = 172972800.

The previous prime is 399451477. The next prime is 399451583. The reversal of 399451492 is 294154993.

It is a super-2 number, since 2×399451492² = 319122988922052128, 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 23 ways as a sum of consecutive naturals, for example, 1185148 + ... + 1185484.

Almost surely, 2^399451492 is an apocalyptic number.

It is an amenable number.

399451492 is an abundant number, since it is smaller than the sum of its proper divisors (406124188).

399451492 is a wasteful number, since it uses less digits than its factorization.

399451492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 460 counting only the distinct ones).

The product of its digits is 349920, while the sum is 46.

The square root of 399451492 is about 19986.2825958206. The cubic root of 399451492 is about 736.4693588773.

The spelling of 399451492 in words is "three hundred ninety-nine million, four hundred fifty-one thousand, four hundred ninety-two".