400189764 has 24 divisors (see below), whose sum is σ = 1005605440. Its totient is φ = 123135264.

The previous prime is 400189759. The next prime is 400189781. The reversal of 400189764 is 467981004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 1282504 + ... + 1282815.

Almost surely, 2^400189764 is an apocalyptic number.

It is an amenable number.

400189764 is an abundant number, since it is smaller than the sum of its proper divisors (605415676).

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

400189764 is a wasteful number, since it uses less digits than its factorization.

400189764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565339 (or 2565337 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 400189764 is about 20004.7435374713. The cubic root of 400189764 is about 736.9227973997.

The spelling of 400189764 in words is "four hundred million, one hundred eighty-nine thousand, seven hundred sixty-four".