399743808 has 112 divisors (see below), whose sum is σ = 1088721216. Its totient is φ = 129392640.

The previous prime is 399743783. The next prime is 399743833. The reversal of 399743808 is 808347993.

It is an interprime number because it is at equal distance from previous prime (399743783) and next prime (399743833).

It is a super-2 number, since 2×399743808² = 319590224068681728, 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 15 ways as a sum of consecutive naturals, for example, 1658568 + ... + 1658808.

Almost surely, 2^399743808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399743808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (544360608).

399743808 is an abundant number, since it is smaller than the sum of its proper divisors (688977408).

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

399743808 is a wasteful number, since it uses less digits than its factorization.

399743808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 51.

The square root of 399743808 is about 19993.5941741349. The cubic root of 399743808 is about 736.6489629000.

The spelling of 399743808 in words is "three hundred ninety-nine million, seven hundred forty-three thousand, eight hundred eight".