400166988 has 72 divisors (see below), whose sum is σ = 1038593808. Its totient is φ = 119778048.

The previous prime is 400166983. The next prime is 400166989. The reversal of 400166988 is 889661004.

It is not an unprimeable number, because it can be changed into a prime (400166981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72370 + ... + 77702.

It is an arithmetic number, because the mean of its divisors is an integer number (14424914).

Almost surely, 2^400166988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400166988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (519296904).

400166988 is an abundant number, since it is smaller than the sum of its proper divisors (638426820).

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

400166988 is a wasteful number, since it uses less digits than its factorization.

400166988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5403 (or 5388 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 400166988 is about 20004.1742643879. The cubic root of 400166988 is about 736.9088169721.

The spelling of 400166988 in words is "four hundred million, one hundred sixty-six thousand, nine hundred eighty-eight".