40181688 has 48 divisors (see below), whose sum is σ = 109234320. Its totient is φ = 13343616.

The previous prime is 40181683. The next prime is 40181707. The reversal of 40181688 is 88618104.

It is a super-2 number, since 2×40181688² = 3229136101058688, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40181683) 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, 21645 + ... + 23427.

It is an arithmetic number, because the mean of its divisors is an integer number (2275715).

Almost surely, 2^40181688 is an apocalyptic number.

It is an amenable number.

40181688 is an abundant number, since it is smaller than the sum of its proper divisors (69052632).

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

40181688 is a wasteful number, since it uses less digits than its factorization.

40181688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108 (or 2101 counting only the distinct ones).

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

The square root of 40181688 is about 6338.9027441664. The cubic root of 40181688 is about 342.5122108350.

The spelling of 40181688 in words is "forty million, one hundred eighty-one thousand, six hundred eighty-eight".