40865181 has 64 divisors (see below), whose sum is σ = 70471680. Its totient is φ = 20528640.

The previous prime is 40865177. The next prime is 40865183. The reversal of 40865181 is 18156804.

It is not a de Polignac number, because 40865181 - 2² = 40865177 is a prime.

It is a super-2 number, since 2×40865181² = 3339926036325522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40865183) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 559761 + ... + 559833.

It is an arithmetic number, because the mean of its divisors is an integer number (1101120).

Almost surely, 2^40865181 is an apocalyptic number.

It is an amenable number.

40865181 is a deficient number, since it is larger than the sum of its proper divisors (29606499).

40865181 is a wasteful number, since it uses less digits than its factorization.

40865181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186.

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 40865181 is about 6392.5879735832. The cubic root of 40865181 is about 344.4433535596.

The spelling of 40865181 in words is "forty million, eight hundred sixty-five thousand, one hundred eighty-one".