400684 has 12 divisors (see below), whose sum is σ = 708400. Its totient is φ = 198288.

The previous prime is 400681. The next prime is 400703. The reversal of 400684 is 486004.

400684 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (400681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24 + ... + 895.

2⁴⁰⁰⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

400684 is a deficient number, since it is larger than the sum of its proper divisors (307716).

400684 is a wasteful number, since it uses less digits than its factorization.

400684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1030 counting only the distinct ones).

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

The square root of 400684 is about 632.9960505406. The cubic root of 400684 is about 73.7226040158.

Adding to 400684 its reverse (486004), we get a palindrome (886688).

The spelling of 400684 in words is "four hundred thousand, six hundred eighty-four".