18893139 has 4 divisors (see below), whose sum is σ = 25190856. Its totient is φ = 12595424.

The previous prime is 18893113. The next prime is 18893141. The reversal of 18893139 is 93139881.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18893139 - 2¹¹ = 18891091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18893139.

It is not an unprimeable number, because it can be changed into a prime (18893179) 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, 3148854 + ... + 3148859.

It is an arithmetic number, because the mean of its divisors is an integer number (6297714).

Almost surely, 2^18893139 is an apocalyptic number.

18893139 is a deficient number, since it is larger than the sum of its proper divisors (6297717).

18893139 is an equidigital number, since it uses as much as digits as its factorization.

18893139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6297716.

The product of its digits is 46656, while the sum is 42.

The square root of 18893139 is about 4346.6238622637. The cubic root of 18893139 is about 266.3389642971.

The spelling of 18893139 in words is "eighteen million, eight hundred ninety-three thousand, one hundred thirty-nine".