398365806 has 32 divisors (see below), whose sum is σ = 813051648. Its totient is φ = 130092480.

The previous prime is 398365783. The next prime is 398365823. The reversal of 398365806 is 608563893.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66570 + ... + 72306.

It is an arithmetic number, because the mean of its divisors is an integer number (25407864).

Almost surely, 2^398365806 is an apocalyptic number.

398365806 is an abundant number, since it is smaller than the sum of its proper divisors (414685842).

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

398365806 is a wasteful number, since it uses less digits than its factorization.

398365806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5976.

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 398365806 is about 19959.1033365730. The cubic root of 398365806 is about 735.8015264594.

It can be divided in two parts, 398365 and 806, that added together give a triangular number (399171 = T₈₉₃).

The spelling of 398365806 in words is "three hundred ninety-eight million, three hundred sixty-five thousand, eight hundred six".