18679213 has 4 divisors (see below), whose sum is σ = 21347680. Its totient is φ = 16010748.

The previous prime is 18679207. The next prime is 18679229. The reversal of 18679213 is 31297681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31297681 = 1181 ⋅26501.

It is a cyclic number.

It is not a de Polignac number, because 18679213 - 2⁵ = 18679181 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 (18679273) 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, 1334223 + ... + 1334236.

It is an arithmetic number, because the mean of its divisors is an integer number (5336920).

Almost surely, 2^18679213 is an apocalyptic number.

It is an amenable number.

18679213 is a deficient number, since it is larger than the sum of its proper divisors (2668467).

18679213 is an equidigital number, since it uses as much as digits as its factorization.

18679213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668466.

The product of its digits is 18144, while the sum is 37.

The square root of 18679213 is about 4321.9455109939. The cubic root of 18679213 is about 265.3298988568.

The spelling of 18679213 in words is "eighteen million, six hundred seventy-nine thousand, two hundred thirteen".