399951130920 has 256 divisors, whose sum is σ = 1330076712960. Its totient is φ = 95397120000.

The previous prime is 399951130889. The next prime is 399951130933. The reversal of 399951130920 is 29031159993.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48824025 + ... + 48832215.

It is an arithmetic number, because the mean of its divisors is an integer number (5195612160).

Almost surely, 2^399951130920 is an apocalyptic number.

399951130920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399951130920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665038356480).

399951130920 is an abundant number, since it is smaller than the sum of its proper divisors (930125582040).

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

399951130920 is a wasteful number, since it uses less digits than its factorization.

399951130920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8808 (or 8804 counting only the distinct ones).

The product of its (nonzero) digits is 590490, while the sum is 51.

The spelling of 399951130920 in words is "three hundred ninety-nine billion, nine hundred fifty-one million, one hundred thirty thousand, nine hundred twenty".