399556608 has 120 divisors (see below), whose sum is σ = 1163883840. Its totient is φ = 120913920.

The previous prime is 399556607. The next prime is 399556631. The reversal of 399556608 is 806655993.

It is not an unprimeable number, because it can be changed into a prime (399556601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540303 + ... + 541041.

It is an arithmetic number, because the mean of its divisors is an integer number (9699032).

Almost surely, 2^399556608 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 399556608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (581941920).

399556608 is an abundant number, since it is smaller than the sum of its proper divisors (764327232).

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

399556608 is an equidigital number, since it uses as much as digits as its factorization.

399556608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 51.

The square root of 399556608 is about 19988.9121264765. The cubic root of 399556608 is about 736.5339540577.

The spelling of 399556608 in words is "three hundred ninety-nine million, five hundred fifty-six thousand, six hundred eight".