18545139 has 24 divisors (see below), whose sum is σ = 28140720. Its totient is φ = 12068352.

The previous prime is 18545117. The next prime is 18545143. The reversal of 18545139 is 93154581.

It is not a de Polignac number, because 18545139 - 2¹⁹ = 18020851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18545179) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191139 + ... + 191235.

It is an arithmetic number, because the mean of its divisors is an integer number (1172530).

Almost surely, 2^18545139 is an apocalyptic number.

18545139 is a deficient number, since it is larger than the sum of its proper divisors (9595581).

18545139 is an frugal number, since it uses more digits than its factorization.

18545139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 173 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 18545139 is about 4306.4067388021. The cubic root of 18545139 is about 264.6935534389.

The spelling of 18545139 in words is "eighteen million, five hundred forty-five thousand, one hundred thirty-nine".