18020039 has 2 divisors, whose sum is σ = 18020040. Its totient is φ = 18020038.

The previous prime is 18020027. The next prime is 18020059. The reversal of 18020039 is 93002081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18020039 - 2²⁴ = 1242823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18019996 and 18020023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18020059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010019 + 9010020.

It is an arithmetic number, because the mean of its divisors is an integer number (9010020).

Almost surely, 2^18020039 is an apocalyptic number.

18020039 is a deficient number, since it is larger than the sum of its proper divisors (1).

18020039 is an equidigital number, since it uses as much as digits as its factorization.

18020039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 18020039 is about 4245.0016489985. The cubic root of 18020039 is about 262.1713571249.

The spelling of 18020039 in words is "eighteen million, twenty thousand, thirty-nine".