18612939 has 4 divisors (see below), whose sum is σ = 24817256. Its totient is φ = 12408624.

The previous prime is 18612929. The next prime is 18612941. The reversal of 18612939 is 93921681.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18612939 - 2⁹ = 18612427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18612897 and 18612906.

It is not an unprimeable number, because it can be changed into a prime (18612929) 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, 3102154 + ... + 3102159.

It is an arithmetic number, because the mean of its divisors is an integer number (6204314).

Almost surely, 2^18612939 is an apocalyptic number.

18612939 is a deficient number, since it is larger than the sum of its proper divisors (6204317).

18612939 is an equidigital number, since it uses as much as digits as its factorization.

18612939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6204316.

The product of its digits is 23328, while the sum is 39.

The square root of 18612939 is about 4314.2715491726. The cubic root of 18612939 is about 265.0157294567.

The spelling of 18612939 in words is "eighteen million, six hundred twelve thousand, nine hundred thirty-nine".