399750988 has 48 divisors (see below), whose sum is σ = 911663424. Its totient is φ = 148838400.

The previous prime is 399750977. The next prime is 399751043. The reversal of 399750988 is 889057993.

It is a super-2 number, since 2×399750988² = 319601704813952288, which contains 22 as substring.

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, 26113 + ... + 38488.

It is an arithmetic number, because the mean of its divisors is an integer number (18992988).

Almost surely, 2^399750988 is an apocalyptic number.

It is an amenable number.

399750988 is an abundant number, since it is smaller than the sum of its proper divisors (511912436).

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

399750988 is a wasteful number, since it uses less digits than its factorization.

399750988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64642 (or 64640 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 58.

The square root of 399750988 is about 19993.7737308393. The cubic root of 399750988 is about 736.6533733147.

The spelling of 399750988 in words is "three hundred ninety-nine million, seven hundred fifty thousand, nine hundred eighty-eight".