399920730828 has 48 divisors (see below), whose sum is σ = 945297077760. Its totient is φ = 131572584000.

The previous prime is 399920730767. The next prime is 399920730829. The reversal of 399920730828 is 828037029993.

It is a happy number.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (399920730829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2638503 + ... + 2785953.

It is an arithmetic number, because the mean of its divisors is an integer number (19693689120).

Almost surely, 2^399920730828 is an apocalyptic number.

It is an amenable number.

399920730828 is an abundant number, since it is smaller than the sum of its proper divisors (545376346932).

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

399920730828 is a wasteful number, since it uses less digits than its factorization.

399920730828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150398 (or 150396 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 60.

The spelling of 399920730828 in words is "three hundred ninety-nine billion, nine hundred twenty million, seven hundred thirty thousand, eight hundred twenty-eight".