18019039 has 4 divisors (see below), whose sum is σ = 18091080. Its totient is φ = 17947000.

The previous prime is 18019007. The next prime is 18019073. The reversal of 18019039 is 93091081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93091081 = 293 ⋅317717.

It is a cyclic number.

It is not a de Polignac number, because 18019039 - 2⁵ = 18019007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18019039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18019739) 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, 35644 + ... + 36145.

It is an arithmetic number, because the mean of its divisors is an integer number (4522770).

Almost surely, 2^18019039 is an apocalyptic number.

18019039 is a deficient number, since it is larger than the sum of its proper divisors (72041).

18019039 is an equidigital number, since it uses as much as digits as its factorization.

18019039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72040.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 18019039 is about 4244.8838617800. The cubic root of 18019039 is about 262.1665074090.

The spelling of 18019039 in words is "eighteen million, nineteen thousand, thirty-nine".