40181992731 has 16 divisors (see below), whose sum is σ = 59685961600. Its totient is φ = 26717307624.

The previous prime is 40181992691. The next prime is 40181992777. The reversal of 40181992731 is 13729918104.

40181992731 is a `hidden beast` number, since 401 + 8 + 199 + 27 + 31 = 666.

It is not a de Polignac number, because 40181992731 - 2⁶ = 40181992667 is a prime.

It is a super-2 number, since 2×40181992731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40181994731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1953121 + ... + 1973586.

It is an arithmetic number, because the mean of its divisors is an integer number (3730372600).

Almost surely, 2^40181992731 is an apocalyptic number.

40181992731 is a deficient number, since it is larger than the sum of its proper divisors (19503968869).

40181992731 is a wasteful number, since it uses less digits than its factorization.

40181992731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927095 (or 3927089 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 40181992731 in words is "forty billion, one hundred eighty-one million, nine hundred ninety-two thousand, seven hundred thirty-one".