398722621172 has 12 divisors (see below), whose sum is σ = 710929956996. Its totient is φ = 195599776320.

The previous prime is 398722621079. The next prime is 398722621201. The reversal of 398722621172 is 271126227893.

It can be written as a sum of positive squares in 2 ways, for example, as 354922828516 + 43799792656 = 595754^2 + 209284^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 398722621172.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 940383329 + ... + 940383752.

It is an arithmetic number, because the mean of its divisors is an integer number (59244163083).

Almost surely, 2^398722621172 is an apocalyptic number.

It is an amenable number.

398722621172 is a deficient number, since it is larger than the sum of its proper divisors (312207335824).

398722621172 is a wasteful number, since it uses less digits than its factorization.

398722621172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880767138 (or 1880767136 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 50.

The spelling of 398722621172 in words is "three hundred ninety-eight billion, seven hundred twenty-two million, six hundred twenty-one thousand, one hundred seventy-two".