18734139 has 16 divisors (see below), whose sum is σ = 28108800. Its totient is φ = 12329928.

The previous prime is 18734129. The next prime is 18734141. The reversal of 18734139 is 93143781.

It is a happy number.

It is not a de Polignac number, because 18734139 - 2⁴ = 18734123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18734129) 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, 2259 + ... + 6524.

It is an arithmetic number, because the mean of its divisors is an integer number (1756800).

Almost surely, 2^18734139 is an apocalyptic number.

18734139 is a deficient number, since it is larger than the sum of its proper divisors (9374661).

18734139 is an equidigital number, since it uses as much as digits as its factorization.

18734139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8871 (or 8865 counting only the distinct ones).

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

The square root of 18734139 is about 4328.2951609150. The cubic root of 18734139 is about 265.5897108183.

The spelling of 18734139 in words is "eighteen million, seven hundred thirty-four thousand, one hundred thirty-nine".