399290880 has 80 divisors (see below), whose sum is σ = 1276507584. Its totient is φ = 106475520.

The previous prime is 399290873. The next prime is 399290891. The reversal of 399290880 is 88092993.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18316 + ... + 33675.

Almost surely, 2^399290880 is an apocalyptic number.

399290880 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399290880 is an abundant number, since it is smaller than the sum of its proper divisors (877216704).

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

399290880 is an equidigital number, since it uses as much as digits as its factorization.

399290880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52017 (or 52001 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The square root of 399290880 is about 19982.2641359782. The cubic root of 399290880 is about 736.3706387773.

The spelling of 399290880 in words is "three hundred ninety-nine million, two hundred ninety thousand, eight hundred eighty".