400864 has 12 divisors (see below), whose sum is σ = 789264. Its totient is φ = 200416.

The previous prime is 400859. The next prime is 400871. The reversal of 400864 is 468004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6232 + ... + 6295.

It is an arithmetic number, because the mean of its divisors is an integer number (65772).

2⁴⁰⁰⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

400864 is a deficient number, since it is larger than the sum of its proper divisors (388400).

400864 is a wasteful number, since it uses less digits than its factorization.

400864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12537 (or 12529 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 400864 is about 633.1382155580. The cubic root of 400864 is about 73.7336418761.

Adding to 400864 its reverse (468004), we get a palindrome (868868).

The spelling of 400864 in words is "four hundred thousand, eight hundred sixty-four".