18968039 has 4 divisors (see below), whose sum is σ = 20083824. Its totient is φ = 17852256.

The previous prime is 18968021. The next prime is 18968051. The reversal of 18968039 is 93086981.

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

It is a cyclic number.

It is not a de Polignac number, because 18968039 - 2²⁴ = 2190823 is a prime.

It is a super-3 number, since 3×18968039³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18968069) 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, 557867 + ... + 557900.

It is an arithmetic number, because the mean of its divisors is an integer number (5020956).

Almost surely, 2^18968039 is an apocalyptic number.

18968039 is a deficient number, since it is larger than the sum of its proper divisors (1115785).

18968039 is a wasteful number, since it uses less digits than its factorization.

18968039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115784.

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

The square root of 18968039 is about 4355.2312223348. The cubic root of 18968039 is about 266.6904584675.

The spelling of 18968039 in words is "eighteen million, nine hundred sixty-eight thousand, thirty-nine".