398920494565 has 64 divisors (see below), whose sum is σ = 520047931392. Its totient is φ = 292669977600.

The previous prime is 398920494551. The next prime is 398920494571. The reversal of 398920494565 is 565494029893.

It is not a de Polignac number, because 398920494565 - 2¹¹ = 398920492517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 398920494497 and 398920494506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 223734664 + ... + 223736446.

It is an arithmetic number, because the mean of its divisors is an integer number (8125748928).

Almost surely, 2^398920494565 is an apocalyptic number.

It is an amenable number.

398920494565 is a deficient number, since it is larger than the sum of its proper divisors (121127436827).

398920494565 is a wasteful number, since it uses less digits than its factorization.

398920494565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290.

The product of its (nonzero) digits is 83980800, while the sum is 64.

The spelling of 398920494565 in words is "three hundred ninety-eight billion, nine hundred twenty million, four hundred ninety-four thousand, five hundred sixty-five".