18238839 has 8 divisors (see below), whose sum is σ = 25375872. Its totient is φ = 11630520.

The previous prime is 18238811. The next prime is 18238849. The reversal of 18238839 is 93883281.

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

It is not a de Polignac number, because 18238839 - 2⁷ = 18238711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18238839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18238849) 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, 132097 + ... + 132234.

It is an arithmetic number, because the mean of its divisors is an integer number (3171984).

Almost surely, 2^18238839 is an apocalyptic number.

18238839 is a deficient number, since it is larger than the sum of its proper divisors (7137033).

18238839 is a wasteful number, since it uses less digits than its factorization.

18238839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264357.

The product of its digits is 82944, while the sum is 42.

The square root of 18238839 is about 4270.6953766336. The cubic root of 18238839 is about 263.2281894324.

The spelling of 18238839 in words is "eighteen million, two hundred thirty-eight thousand, eight hundred thirty-nine".