40188031 has 12 divisors (see below), whose sum is σ = 44700312. Its totient is φ = 36088416.

The previous prime is 40188013. The next prime is 40188047. The reversal of 40188031 is 13088104.

It is not a de Polignac number, because 40188031 - 2⁵ = 40187999 is a prime.

It is a super-2 number, since 2×40188031² = 3230155671313922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40187987 and 40188005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40188091) 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, 3040 + ... + 9466.

It is an arithmetic number, because the mean of its divisors is an integer number (3725026).

Almost surely, 2^40188031 is an apocalyptic number.

40188031 is a deficient number, since it is larger than the sum of its proper divisors (4512281).

40188031 is a wasteful number, since it uses less digits than its factorization.

40188031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6490 (or 6477 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 40188031 is about 6339.4030476063. The cubic root of 40188031 is about 342.5302326484.

The spelling of 40188031 in words is "forty million, one hundred eighty-eight thousand, thirty-one".