18745139 has 8 divisors (see below), whose sum is σ = 21487200. Its totient is φ = 16019136.

The previous prime is 18745127. The next prime is 18745171. The reversal of 18745139 is 93154781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18745139 - 2¹² = 18741043 is a prime.

It is a super-2 number, since 2×18745139² = 702760472258642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18745189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1394 + ... + 6279.

It is an arithmetic number, because the mean of its divisors is an integer number (2685900).

Almost surely, 2^18745139 is an apocalyptic number.

18745139 is a deficient number, since it is larger than the sum of its proper divisors (2742061).

18745139 is an equidigital number, since it uses as much as digits as its factorization.

18745139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8029.

The product of its digits is 30240, while the sum is 38.

The square root of 18745139 is about 4329.5656826061. The cubic root of 18745139 is about 265.6416821634.

The spelling of 18745139 in words is "eighteen million, seven hundred forty-five thousand, one hundred thirty-nine".