400634 has 16 divisors (see below), whose sum is σ = 682080. Its totient is φ = 174960.

The previous prime is 400619. The next prime is 400643. The reversal of 400634 is 436004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89 + ... + 899.

It is an arithmetic number, because the mean of its divisors is an integer number (42630).

2⁴⁰⁰⁶³⁴ is an apocalyptic number.

400634 is a deficient number, since it is larger than the sum of its proper divisors (281446).

400634 is a wasteful number, since it uses less digits than its factorization.

400634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 400634 is about 632.9565545912. The cubic root of 400634 is about 73.7195373568.

Adding to 400634 its reverse (436004), we get a palindrome (836638).

The spelling of 400634 in words is "four hundred thousand, six hundred thirty-four".