40131018 has 16 divisors (see below), whose sum is σ = 89180160. Its totient is φ = 13376988.

The previous prime is 40131011. The next prime is 40131023. The reversal of 40131018 is 81013104.

It is a super-2 number, since 2×40131018² = 3220997211432648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (40131011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371530 + ... + 371637.

It is an arithmetic number, because the mean of its divisors is an integer number (5573760).

Almost surely, 2^40131018 is an apocalyptic number.

40131018 is an abundant number, since it is smaller than the sum of its proper divisors (49049142).

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

40131018 is a wasteful number, since it uses less digits than its factorization.

40131018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743178 (or 743172 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 40131018 is about 6334.9047348796. The cubic root of 40131018 is about 342.3681784432.

The spelling of 40131018 in words is "forty million, one hundred thirty-one thousand, eighteen".