399122859520 has 240 divisors, whose sum is σ = 1214401679568. Its totient is φ = 124401500160.

The previous prime is 399122859503. The next prime is 399122859521. The reversal of 399122859520 is 25958221993.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399122859521) 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 23 ways as a sum of consecutive naturals, for example, 1235214 + ... + 1524466.

Almost surely, 2^399122859520 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 399122859520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (607200839784).

399122859520 is an abundant number, since it is smaller than the sum of its proper divisors (815278820048).

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

399122859520 is a wasteful number, since it uses less digits than its factorization.

399122859520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289301 (or 289278 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 55.

The spelling of 399122859520 in words is "three hundred ninety-nine billion, one hundred twenty-two million, eight hundred fifty-nine thousand, five hundred twenty".