398720564 has 24 divisors (see below), whose sum is σ = 767198208. Its totient is φ = 179807040.

The previous prime is 398720561. The next prime is 398720591. The reversal of 398720564 is 465027893.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398720561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30089 + ... + 41264.

It is an arithmetic number, because the mean of its divisors is an integer number (31966592).

Almost surely, 2^398720564 is an apocalyptic number.

It is an amenable number.

398720564 is a deficient number, since it is larger than the sum of its proper divisors (368477644).

398720564 is a wasteful number, since it uses less digits than its factorization.

398720564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71495 (or 71493 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 398720564 is about 19967.9884815672. The cubic root of 398720564 is about 736.0198802325.

It can be divided in two parts, 3 and 98720564, that multiplied together give a palindrome (296161692).

The spelling of 398720564 in words is "three hundred ninety-eight million, seven hundred twenty thousand, five hundred sixty-four".