18743139 has 12 divisors (see below), whose sum is σ = 28498600. Its totient is φ = 11837664.

The previous prime is 18743119. The next prime is 18743147. The reversal of 18743139 is 93134781.

It is a happy number.

It is not a de Polignac number, because 18743139 - 2⁹ = 18742627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18743119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54634 + ... + 54975.

Almost surely, 2^18743139 is an apocalyptic number.

18743139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18743139 is a deficient number, since it is larger than the sum of its proper divisors (9755461).

18743139 is a wasteful number, since it uses less digits than its factorization.

18743139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109634 (or 109631 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 18743139 is about 4329.3347063954. The cubic root of 18743139 is about 265.6322343405.

The spelling of 18743139 in words is "eighteen million, seven hundred forty-three thousand, one hundred thirty-nine".