18085440938 has 8 divisors (see below), whose sum is σ = 27194490660. Its totient is φ = 9020610720.

The previous prime is 18085440929. The next prime is 18085440943. The reversal of 18085440938 is 83904458081.

It can be written as a sum of positive squares in 2 ways, for example, as 17850830449 + 234610489 = 133607^2 + 15317^2 .

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

It is a super-3 number, since 3×18085440938³ (a number of 32 digits) contains 333 as substring.

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, 11053853 + ... + 11055488.

Almost surely, 2^18085440938 is an apocalyptic number.

18085440938 is a deficient number, since it is larger than the sum of its proper divisors (9109049722).

18085440938 is a wasteful number, since it uses less digits than its factorization.

18085440938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22109752.

The product of its (nonzero) digits is 1105920, while the sum is 50.

The spelling of 18085440938 in words is "eighteen billion, eighty-five million, four hundred forty thousand, nine hundred thirty-eight".