18839139 has 16 divisors (see below), whose sum is σ = 28594944. Its totient is φ = 10920800.

The previous prime is 18839137. The next prime is 18839141. The reversal of 18839139 is 93193881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18839137) and next prime (18839141).

It is not a de Polignac number, because 18839139 - 2¹ = 18839137 is a prime.

It is a super-2 number, since 2×18839139² = 709826316522642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18839139.

It is not an unprimeable number, because it can be changed into a prime (18839137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11652 + ... + 13169.

It is an arithmetic number, because the mean of its divisors is an integer number (1787184).

Almost surely, 2^18839139 is an apocalyptic number.

18839139 is a deficient number, since it is larger than the sum of its proper divisors (9755805).

18839139 is a wasteful number, since it uses less digits than its factorization.

18839139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24858.

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

The square root of 18839139 is about 4340.4076997443. The cubic root of 18839139 is about 266.0849738886.

The spelling of 18839139 in words is "eighteen million, eight hundred thirty-nine thousand, one hundred thirty-nine".