18465979 has 4 divisors (see below), whose sum is σ = 21103984. Its totient is φ = 15827976.

The previous prime is 18465973. The next prime is 18465989. The reversal of 18465979 is 97956481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97956481 = 7 ⋅13993783.

It is a cyclic number.

It is not a de Polignac number, because 18465979 - 2⁵ = 18465947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18465973) 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 3 ways as a sum of consecutive naturals, for example, 1318992 + ... + 1319005.

It is an arithmetic number, because the mean of its divisors is an integer number (5275996).

Almost surely, 2^18465979 is an apocalyptic number.

18465979 is a deficient number, since it is larger than the sum of its proper divisors (2638005).

18465979 is an equidigital number, since it uses as much as digits as its factorization.

18465979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638004.

The product of its digits is 544320, while the sum is 49.

The square root of 18465979 is about 4297.2059527093. The cubic root of 18465979 is about 264.3164011395.

The spelling of 18465979 in words is "eighteen million, four hundred sixty-five thousand, nine hundred seventy-nine".