400261986 has 20 divisors (see below), whose sum is σ = 896883702. Its totient is φ = 133420608.

The previous prime is 400261951. The next prime is 400261997. The reversal of 400261986 is 689162004.

It can be written as a sum of positive squares in only one way, i.e., 386712225 + 13549761 = 19665^2 + 3681^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400261986.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1235215 + ... + 1235538.

Almost surely, 2^400261986 is an apocalyptic number.

400261986 is an abundant number, since it is smaller than the sum of its proper divisors (496621716).

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

400261986 is a wasteful number, since it uses less digits than its factorization.

400261986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470767 (or 2470758 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 400261986 is about 20006.5485779032. The cubic root of 400261986 is about 736.9671254008.

The spelling of 400261986 in words is "four hundred million, two hundred sixty-one thousand, nine hundred eighty-six".