399894791628 has 24 divisors (see below), whose sum is σ = 963187456000. Its totient is φ = 128998319760.

The previous prime is 399894791609. The next prime is 399894791651. The reversal of 399894791628 is 826197498993.

It is a self number, because there is not a number n which added to its sum of digits gives 399894791628.

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, 537492628 + ... + 537493371.

Almost surely, 2^399894791628 is an apocalyptic number.

It is an amenable number.

399894791628 is an abundant number, since it is smaller than the sum of its proper divisors (563292664372).

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

399894791628 is a wasteful number, since it uses less digits than its factorization.

399894791628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074986037 (or 1074986035 counting only the distinct ones).

The product of its digits is 423263232, while the sum is 75.

The spelling of 399894791628 in words is "three hundred ninety-nine billion, eight hundred ninety-four million, seven hundred ninety-one thousand, six hundred twenty-eight".