398780831636 has 24 divisors (see below), whose sum is σ = 761947107264. Its totient is φ = 181112050880.

The previous prime is 398780831633. The next prime is 398780831671. The reversal of 398780831636 is 636138087893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398780831633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3746000 + ... + 3850983.

It is an arithmetic number, because the mean of its divisors is an integer number (31747796136).

Almost surely, 2^398780831636 is an apocalyptic number.

It is an amenable number.

398780831636 is a deficient number, since it is larger than the sum of its proper divisors (363166275628).

398780831636 is a wasteful number, since it uses less digits than its factorization.

398780831636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7598191 (or 7598189 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 398780831636 in words is "three hundred ninety-eight billion, seven hundred eighty million, eight hundred thirty-one thousand, six hundred thirty-six".