40188939 has 16 divisors (see below), whose sum is σ = 61340160. Its totient is φ = 22927680.

The previous prime is 40188937. The next prime is 40188947. The reversal of 40188939 is 93988104.

It is not a de Polignac number, because 40188939 - 2¹ = 40188937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40188939.

It is not an unprimeable number, because it can be changed into a prime (40188937) 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, 16479 + ... + 18759.

It is an arithmetic number, because the mean of its divisors is an integer number (3833760).

Almost surely, 2^40188939 is an apocalyptic number.

40188939 is a deficient number, since it is larger than the sum of its proper divisors (21151221).

40188939 is a wasteful number, since it uses less digits than its factorization.

40188939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 40188939 is about 6339.4746627777. The cubic root of 40188939 is about 342.5328123145.

The spelling of 40188939 in words is "forty million, one hundred eighty-eight thousand, nine hundred thirty-nine".