18395139 has 36 divisors (see below), whose sum is σ = 30378264. Its totient is φ = 9870336.

The previous prime is 18395137. The next prime is 18395149. The reversal of 18395139 is 93159381.

It is not a de Polignac number, because 18395139 - 2¹ = 18395137 is a prime.

It is a super-2 number, since 2×18395139² = 676762277658642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18395097 and 18395106.

It is not an unprimeable number, because it can be changed into a prime (18395137) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42267 + ... + 42699.

Almost surely, 2^18395139 is an apocalyptic number.

18395139 is a deficient number, since it is larger than the sum of its proper divisors (11983125).

18395139 is a wasteful number, since it uses less digits than its factorization.

18395139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 460 counting only the distinct ones).

The product of its digits is 29160, while the sum is 39.

The square root of 18395139 is about 4288.9554672437. The cubic root of 18395139 is about 263.9779739429.

The spelling of 18395139 in words is "eighteen million, three hundred ninety-five thousand, one hundred thirty-nine".