399522449424 has 120 divisors (see below), whose sum is σ = 1204942009728. Its totient is φ = 113736994560.

The previous prime is 399522449407. The next prime is 399522449437. The reversal of 399522449424 is 424944225993.

It is a Smith number, since the sum of its digits (57) 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 23 ways as a sum of consecutive naturals, for example, 344889 + ... + 958119.

Almost surely, 2^399522449424 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 399522449424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (602471004864).

399522449424 is an abundant number, since it is smaller than the sum of its proper divisors (805419560304).

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

399522449424 is a wasteful number, since it uses less digits than its factorization.

399522449424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613533 (or 613520 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 57.

The spelling of 399522449424 in words is "three hundred ninety-nine billion, five hundred twenty-two million, four hundred forty-nine thousand, four hundred twenty-four".