18287909438 has 8 divisors (see below), whose sum is σ = 27442119432. Its totient is φ = 9140536296.

The previous prime is 18287909371. The next prime is 18287909441. The reversal of 18287909438 is 83490978281.

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

It is a super-2 number, since 2×18287909438² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1702520 + ... + 1713227.

It is an arithmetic number, because the mean of its divisors is an integer number (3430264929).

Almost surely, 2^18287909438 is an apocalyptic number.

18287909438 is a deficient number, since it is larger than the sum of its proper divisors (9154209994).

18287909438 is a wasteful number, since it uses less digits than its factorization.

18287909438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3418426.

The product of its (nonzero) digits is 6967296, while the sum is 59.

The spelling of 18287909438 in words is "eighteen billion, two hundred eighty-seven million, nine hundred nine thousand, four hundred thirty-eight".