18013039 has 4 divisors (see below), whose sum is σ = 19650600. Its totient is φ = 16375480.

The previous prime is 18013003. The next prime is 18013049. The reversal of 18013039 is 93031081.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18013039 - 2¹¹ = 18010991 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 (18013049) 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, 818764 + ... + 818785.

It is an arithmetic number, because the mean of its divisors is an integer number (4912650).

Almost surely, 2^18013039 is an apocalyptic number.

18013039 is a deficient number, since it is larger than the sum of its proper divisors (1637561).

18013039 is a wasteful number, since it uses less digits than its factorization.

18013039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1637560.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 18013039 is about 4244.1770698217. The cubic root of 18013039 is about 262.1374053452.

The spelling of 18013039 in words is "eighteen million, thirteen thousand, thirty-nine".