18700117438 has 8 divisors (see below), whose sum is σ = 28192563432. Its totient is φ = 9302596296.

The previous prime is 18700117427. The next prime is 18700117451. The reversal of 18700117438 is 83471100781.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18700117438.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23730720 + ... + 23731507.

It is an arithmetic number, because the mean of its divisors is an integer number (3524070429).

Almost surely, 2^18700117438 is an apocalyptic number.

18700117438 is a deficient number, since it is larger than the sum of its proper divisors (9492445994).

18700117438 is a wasteful number, since it uses less digits than its factorization.

18700117438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47462426.

The product of its (nonzero) digits is 37632, while the sum is 40.

The spelling of 18700117438 in words is "eighteen billion, seven hundred million, one hundred seventeen thousand, four hundred thirty-eight".