398892621688 has 32 divisors (see below), whose sum is σ = 863911830960. Its totient is φ = 170649249280.

The previous prime is 398892621643. The next prime is 398892621761. The reversal of 398892621688 is 886126298893.

It is a congruent number.

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, 133318231 + ... + 133321222.

Almost surely, 2^398892621688 is an apocalyptic number.

It is an amenable number.

398892621688 is an abundant number, since it is smaller than the sum of its proper divisors (465019209272).

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

398892621688 is a wasteful number, since it uses less digits than its factorization.

398892621688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266639487 (or 266639483 counting only the distinct ones).

The product of its digits is 143327232, while the sum is 70.

The spelling of 398892621688 in words is "three hundred ninety-eight billion, eight hundred ninety-two million, six hundred twenty-one thousand, six hundred eighty-eight".