18689039 has 4 divisors (see below), whose sum is σ = 18697824. Its totient is φ = 18680256.

The previous prime is 18689023. The next prime is 18689051. The reversal of 18689039 is 93098681.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18689039 - 2⁴ = 18689023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18689059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1034 + ... + 6200.

It is an arithmetic number, because the mean of its divisors is an integer number (4674456).

Almost surely, 2^18689039 is an apocalyptic number.

18689039 is a deficient number, since it is larger than the sum of its proper divisors (8785).

18689039 is an equidigital number, since it uses as much as digits as its factorization.

18689039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8784.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 18689039 is about 4323.0821181190. The cubic root of 18689039 is about 265.3764153521.

The spelling of 18689039 in words is "eighteen million, six hundred eighty-nine thousand, thirty-nine".