18939039 has 12 divisors (see below), whose sum is σ = 29375064. Its totient is φ = 10822224.

The previous prime is 18939031. The next prime is 18939043. The reversal of 18939039 is 93093981.

It is a happy number.

It is not a de Polignac number, because 18939039 - 2³ = 18939031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64272 + ... + 64565.

It is an arithmetic number, because the mean of its divisors is an integer number (2447922).

Almost surely, 2^18939039 is an apocalyptic number.

18939039 is a deficient number, since it is larger than the sum of its proper divisors (10436025).

18939039 is a wasteful number, since it uses less digits than its factorization.

18939039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128854 (or 128847 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 18939039 is about 4351.9006192697. The cubic root of 18939039 is about 266.5544758965.

The spelling of 18939039 in words is "eighteen million, nine hundred thirty-nine thousand, thirty-nine".