18241979 has 8 divisors (see below), whose sum is σ = 20890848. Its totient is φ = 15603840.

The previous prime is 18241973. The next prime is 18241991. The reversal of 18241979 is 97914281.

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

It is not a de Polignac number, because 18241979 - 2⁴ = 18241963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18241973) 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, 1379 + ... + 6195.

It is an arithmetic number, because the mean of its divisors is an integer number (2611356).

Almost surely, 2^18241979 is an apocalyptic number.

18241979 is a deficient number, since it is larger than the sum of its proper divisors (2648869).

18241979 is an equidigital number, since it uses as much as digits as its factorization.

18241979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365.

The product of its digits is 36288, while the sum is 41.

The square root of 18241979 is about 4271.0629824436. The cubic root of 18241979 is about 263.2432943611.

The spelling of 18241979 in words is "eighteen million, two hundred forty-one thousand, nine hundred seventy-nine".