400986 has 12 divisors (see below), whose sum is σ = 868842. Its totient is φ = 133656.

The previous prime is 400963. The next prime is 400997. The reversal of 400986 is 689004.

It can be written as a sum of positive squares in only one way, i.e., 281961 + 119025 = 531^2 + 345^2 .

It is a Curzon 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, 11121 + ... + 11156.

2⁴⁰⁰⁹⁸⁶ is an apocalyptic number.

400986 is an abundant number, since it is smaller than the sum of its proper divisors (467856).

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

400986 is a wasteful number, since it uses less digits than its factorization.

400986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22285 (or 22282 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 400986 is about 633.2345537003. The cubic root of 400986 is about 73.7411212140.

It can be divided in two parts, 40098 and 6, that added together give a palindrome (40104).

The spelling of 400986 in words is "four hundred thousand, nine hundred eighty-six".