18744979 has 8 divisors (see below), whose sum is σ = 20541888. Its totient is φ = 16963560.

The previous prime is 18744941. The next prime is 18744983. The reversal of 18744979 is 97944781.

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 18744979 - 2⁷ = 18744851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18744919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1257 + ... + 6250.

It is an arithmetic number, because the mean of its divisors is an integer number (2567736).

Almost surely, 2^18744979 is an apocalyptic number.

18744979 is a deficient number, since it is larger than the sum of its proper divisors (1796909).

18744979 is a wasteful number, since it uses less digits than its factorization.

18744979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7745.

The product of its digits is 508032, while the sum is 49.

The square root of 18744979 is about 4329.5472049627. The cubic root of 18744979 is about 265.6409263623.

The spelling of 18744979 in words is "eighteen million, seven hundred forty-four thousand, nine hundred seventy-nine".