18993579387 has 16 divisors (see below), whose sum is σ = 27022834560. Its totient is φ = 11831614272.

The previous prime is 18993579383. The next prime is 18993579389. The reversal of 18993579387 is 78397539981.

It is not a de Polignac number, because 18993579387 - 2² = 18993579383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18993579383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2278173 + ... + 2286494.

It is an arithmetic number, because the mean of its divisors is an integer number (1688927160).

Almost surely, 2^18993579387 is an apocalyptic number.

18993579387 is a deficient number, since it is larger than the sum of its proper divisors (8029255173).

18993579387 is a wasteful number, since it uses less digits than its factorization.

18993579387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564762.

The product of its digits is 102876480, while the sum is 69.

The spelling of 18993579387 in words is "eighteen billion, nine hundred ninety-three million, five hundred seventy-nine thousand, three hundred eighty-seven".