18752139 has 24 divisors (see below), whose sum is σ = 32778720. Its totient is φ = 10084608.

The previous prime is 18752131. The next prime is 18752141. The reversal of 18752139 is 93125781.

It is not a de Polignac number, because 18752139 - 2³ = 18752131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18752131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7684 + ... + 9825.

It is an arithmetic number, because the mean of its divisors is an integer number (1365780).

Almost surely, 2^18752139 is an apocalyptic number.

18752139 is a deficient number, since it is larger than the sum of its proper divisors (14026581).

18752139 is a wasteful number, since it uses less digits than its factorization.

18752139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17539 (or 17536 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 18752139 is about 4330.3740023236. The cubic root of 18752139 is about 265.6747442523.

It can be divided in two parts, 187 and 52139, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 18752139 in words is "eighteen million, seven hundred fifty-two thousand, one hundred thirty-nine".