18339919 has 8 divisors (see below), whose sum is σ = 20432160. Its totient is φ = 16345056.

The previous prime is 18339913. The next prime is 18340019. The reversal of 18339919 is 91993381.

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

It is not a de Polignac number, because 18339919 - 2³ = 18339911 is a prime.

It is a super-2 number, since 2×18339919² = 672705257853122, which contains 22 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 (18339911) 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, 23947 + ... + 24700.

It is an arithmetic number, because the mean of its divisors is an integer number (2554020).

Almost surely, 2^18339919 is an apocalyptic number.

18339919 is a deficient number, since it is larger than the sum of its proper divisors (2092241).

18339919 is a wasteful number, since it uses less digits than its factorization.

18339919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48689.

The product of its digits is 52488, while the sum is 43.

The square root of 18339919 is about 4282.5131640195. The cubic root of 18339919 is about 263.7135657915.

The spelling of 18339919 in words is "eighteen million, three hundred thirty-nine thousand, nine hundred nineteen".