400818 has 16 divisors (see below), whose sum is σ = 874656. Its totient is φ = 121440.

The previous prime is 400759. The next prime is 400823. The reversal of 400818 is 818004.

It is a junction number, because it is equal to n+sod(n) for n = 400794 and 400803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2971 + ... + 3102.

It is an arithmetic number, because the mean of its divisors is an integer number (54666).

2⁴⁰⁰⁸¹⁸ is an apocalyptic number.

400818 is an abundant number, since it is smaller than the sum of its proper divisors (473838).

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

400818 is a wasteful number, since it uses less digits than its factorization.

400818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6089.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 400818 is about 633.1018875347. The cubic root of 400818 is about 73.7308214039.

The spelling of 400818 in words is "four hundred thousand, eight hundred eighteen".