400536 has 24 divisors (see below), whose sum is σ = 1084980. Its totient is φ = 133488.

The previous prime is 400523. The next prime is 400559. The reversal of 400536 is 635004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2710 + ... + 2853.

2⁴⁰⁰⁵³⁶ is an apocalyptic number.

It is an amenable number.

400536 is an abundant number, since it is smaller than the sum of its proper divisors (684444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400536 is a wasteful number, since it uses less digits than its factorization.

400536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5575 (or 5568 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 400536 is about 632.8791353805. The cubic root of 400536 is about 73.7135259650.

The spelling of 400536 in words is "four hundred thousand, five hundred thirty-six".