18420979489 has 8 divisors (see below), whose sum is σ = 20098120032. Its totient is φ = 16744256640.

The previous prime is 18420979439. The next prime is 18420979501. The reversal of 18420979489 is 98497902481.

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

It is a cyclic number.

It is not a de Polignac number, because 18420979489 - 2¹¹ = 18420977441 is a prime.

It is a super-2 number, since 2×18420979489² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18420979429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8359 + ... + 192124.

It is an arithmetic number, because the mean of its divisors is an integer number (2512265004).

Almost surely, 2^18420979489 is an apocalyptic number.

It is an amenable number.

18420979489 is a deficient number, since it is larger than the sum of its proper divisors (1677140543).

18420979489 is a wasteful number, since it uses less digits than its factorization.

18420979489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208847.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 18420979489 in words is "eighteen billion, four hundred twenty million, nine hundred seventy-nine thousand, four hundred eighty-nine".