40188139 has 8 divisors (see below), whose sum is σ = 40604432. Its totient is φ = 39774240.

The previous prime is 40188133. The next prime is 40188157. The reversal of 40188139 is 93188104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40188139 - 2⁹ = 40187627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40188133) 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, 60469 + ... + 61129.

It is an arithmetic number, because the mean of its divisors is an integer number (5075554).

Almost surely, 2^40188139 is an apocalyptic number.

40188139 is a deficient number, since it is larger than the sum of its proper divisors (416293).

40188139 is a wasteful number, since it uses less digits than its factorization.

40188139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 40188139 is about 6339.4115657528. The cubic root of 40188139 is about 342.5305394829.

The spelling of 40188139 in words is "forty million, one hundred eighty-eight thousand, one hundred thirty-nine".