18028979 has 4 divisors (see below), whose sum is σ = 18059976. Its totient is φ = 17997984.

The previous prime is 18028973. The next prime is 18028999. The reversal of 18028979 is 97982081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97982081 = 83 ⋅1180507.

It is a cyclic number.

It is not a de Polignac number, because 18028979 - 2⁸ = 18028723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18028973) 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, 14609 + ... + 15794.

It is an arithmetic number, because the mean of its divisors is an integer number (4514994).

Almost surely, 2^18028979 is an apocalyptic number.

18028979 is a deficient number, since it is larger than the sum of its proper divisors (30997).

18028979 is an equidigital number, since it uses as much as digits as its factorization.

18028979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30996.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 18028979 is about 4246.0545215529. The cubic root of 18028979 is about 262.2147056149.

The spelling of 18028979 in words is "eighteen million, twenty-eight thousand, nine hundred seventy-nine".