18343979 has 8 divisors (see below), whose sum is σ = 19038000. Its totient is φ = 17654112.

The previous prime is 18343943. The next prime is 18344017. The reversal of 18343979 is 97934381.

It is a happy number.

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 18343979 - 2²⁰ = 17295403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18343939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10157 + ... + 11825.

It is an arithmetic number, because the mean of its divisors is an integer number (2379750).

Almost surely, 2^18343979 is an apocalyptic number.

18343979 is a deficient number, since it is larger than the sum of its proper divisors (694021).

18343979 is a wasteful number, since it uses less digits than its factorization.

18343979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077.

The product of its digits is 163296, while the sum is 44.

The square root of 18343979 is about 4282.9871585145. The cubic root of 18343979 is about 263.7330242213.

The spelling of 18343979 in words is "eighteen million, three hundred forty-three thousand, nine hundred seventy-nine".