18941139 has 24 divisors (see below), whose sum is σ = 32034912. Its totient is φ = 10558080.

The previous prime is 18941137. The next prime is 18941149. The reversal of 18941139 is 93114981.

It is not a de Polignac number, because 18941139 - 2¹ = 18941137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18941137) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1084 + ... + 6249.

It is an arithmetic number, because the mean of its divisors is an integer number (1334788).

Almost surely, 2^18941139 is an apocalyptic number.

18941139 is a deficient number, since it is larger than the sum of its proper divisors (13093773).

18941139 is a wasteful number, since it uses less digits than its factorization.

18941139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7387 (or 7384 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 18941139 is about 4352.1418864738. The cubic root of 18941139 is about 266.5643275705.

It can be divided in two parts, 189 and 41139, that added together give a triangular number (41328 = T₂₈₇).

The spelling of 18941139 in words is "eighteen million, nine hundred forty-one thousand, one hundred thirty-nine".