40188816 has 60 divisors (see below), whose sum is σ = 119096172. Its totient is φ = 12607488.

The previous prime is 40188773. The next prime is 40188817. The reversal of 40188816 is 61888104.

It can be written as a sum of positive squares in 2 ways, for example, as 20793600 + 19395216 = 4560^2 + 4404^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (40188817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5761 + ... + 10656.

Almost surely, 2^40188816 is an apocalyptic number.

It is an amenable number.

40188816 is an abundant number, since it is smaller than the sum of its proper divisors (78907356).

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

40188816 is a wasteful number, since it uses less digits than its factorization.

40188816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16448 (or 16439 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 40188816 is about 6339.4649616509. The cubic root of 40188816 is about 342.5324628686.

The spelling of 40188816 in words is "forty million, one hundred eighty-eight thousand, eight hundred sixteen".