18013839 has 8 divisors (see below), whose sum is σ = 24097920. Its totient is φ = 11969496.

The previous prime is 18013823. The next prime is 18013841. The reversal of 18013839 is 93831081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18013839 - 2⁴ = 18013823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18013819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8859 + ... + 10700.

It is an arithmetic number, because the mean of its divisors is an integer number (3012240).

Almost surely, 2^18013839 is an apocalyptic number.

18013839 is a deficient number, since it is larger than the sum of its proper divisors (6084081).

18013839 is a wasteful number, since it uses less digits than its factorization.

18013839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19869.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 18013839 is about 4244.2713155499. The cubic root of 18013839 is about 262.1412859937.

The spelling of 18013839 in words is "eighteen million, thirteen thousand, eight hundred thirty-nine".