400564 has 12 divisors (see below), whose sum is σ = 705600. Its totient is φ = 198968.

The previous prime is 400559. The next prime is 400579. The reversal of 400564 is 465004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (58800).

2⁴⁰⁰⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

400564 is a deficient number, since it is larger than the sum of its proper divisors (305036).

400564 is a wasteful number, since it uses less digits than its factorization.

400564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 400564 is about 632.9012561214. The cubic root of 400564 is about 73.7152436056.

Adding to 400564 its reverse (465004), we get a palindrome (865568).

The spelling of 400564 in words is "four hundred thousand, five hundred sixty-four".