18390979189 has 4 divisors (see below), whose sum is σ = 20062886400. Its totient is φ = 16719071980.

The previous prime is 18390979141. The next prime is 18390979207. The reversal of 18390979189 is 98197909381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18390979189 - 2¹⁷ = 18390848117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18390979189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390979109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835953589 + ... + 835953610.

It is an arithmetic number, because the mean of its divisors is an integer number (5015721600).

Almost surely, 2^18390979189 is an apocalyptic number.

It is an amenable number.

18390979189 is a deficient number, since it is larger than the sum of its proper divisors (1671907211).

18390979189 is a wasteful number, since it uses less digits than its factorization.

18390979189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671907210.

The product of its (nonzero) digits is 8817984, while the sum is 64.

The spelling of 18390979189 in words is "eighteen billion, three hundred ninety million, nine hundred seventy-nine thousand, one hundred eighty-nine".