18039023 has 16 divisors (see below), whose sum is σ = 19782144. Its totient is φ = 16383360.

The previous prime is 18039019. The next prime is 18039029. The reversal of 18039023 is 32093081.

It is a cyclic number.

It is not a de Polignac number, because 18039023 - 2² = 18039019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18038983 and 18039001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85388 + ... + 85598.

It is an arithmetic number, because the mean of its divisors is an integer number (1236384).

Almost surely, 2^18039023 is an apocalyptic number.

18039023 is a deficient number, since it is larger than the sum of its proper divisors (1743121).

18039023 is a wasteful number, since it uses less digits than its factorization.

18039023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 18039023 is about 4247.2371019287. The cubic root of 18039023 is about 262.2633901166.

The spelling of 18039023 in words is "eighteen million, thirty-nine thousand, twenty-three".