18845939 has 6 divisors (see below), whose sum is σ = 21922884. Its totient is φ = 16153620.

The previous prime is 18845921. The next prime is 18845941. The reversal of 18845939 is 93954881.

It is not a de Polignac number, because 18845939 - 2⁸ = 18845683 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18845893 and 18845902.

It is not an unprimeable number, because it can be changed into a prime (18845909) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192257 + ... + 192354.

It is an arithmetic number, because the mean of its divisors is an integer number (3653814).

Almost surely, 2^18845939 is an apocalyptic number.

18845939 is a deficient number, since it is larger than the sum of its proper divisors (3076945).

18845939 is an equidigital number, since it uses as much as digits as its factorization.

18845939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384625 (or 384618 counting only the distinct ones).

The product of its digits is 311040, while the sum is 47.

The square root of 18845939 is about 4341.1909656222. The cubic root of 18845939 is about 266.1169845547.

The spelling of 18845939 in words is "eighteen million, eight hundred forty-five thousand, nine hundred thirty-nine".