18097879 has 4 divisors (see below), whose sum is σ = 18139176. Its totient is φ = 18056584.

The previous prime is 18097817. The next prime is 18097889. The reversal of 18097879 is 97879081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97879081 = 17 ⋅5757593.

It is a cyclic number.

It is not a de Polignac number, because 18097879 - 2¹⁵ = 18065111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18097889) 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, 19984 + ... + 20869.

It is an arithmetic number, because the mean of its divisors is an integer number (4534794).

Almost surely, 2^18097879 is an apocalyptic number.

18097879 is a deficient number, since it is larger than the sum of its proper divisors (41297).

18097879 is an equidigital number, since it uses as much as digits as its factorization.

18097879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41296.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 18097879 is about 4254.1601991462. The cubic root of 18097879 is about 262.5483097783.

The spelling of 18097879 in words is "eighteen million, ninety-seven thousand, eight hundred seventy-nine".