400806 has 24 divisors (see below), whose sum is σ = 992784. Its totient is φ = 114480.

The previous prime is 400759. The next prime is 400823. The reversal of 400806 is 608004.

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 11 ways as a sum of consecutive naturals, for example, 1465 + ... + 1716.

It is an arithmetic number, because the mean of its divisors is an integer number (41366).

2⁴⁰⁰⁸⁰⁶ is an apocalyptic number.

400806 is an abundant number, since it is smaller than the sum of its proper divisors (591978).

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

400806 is a wasteful number, since it uses less digits than its factorization.

400806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3196 (or 3193 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 400806 is about 633.0924103162. The cubic root of 400806 is about 73.7300855931.

The spelling of 400806 in words is "four hundred thousand, eight hundred six".