18019839 has 8 divisors (see below), whose sum is σ = 24433920. Its totient is φ = 11809496.

The previous prime is 18019823. The next prime is 18019849. The reversal of 18019839 is 93891081.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18019839 - 2⁴ = 18019823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18019797 and 18019806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18019819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50727 + ... + 51080.

It is an arithmetic number, because the mean of its divisors is an integer number (3054240).

Almost surely, 2^18019839 is an apocalyptic number.

18019839 is a deficient number, since it is larger than the sum of its proper divisors (6414081).

18019839 is a wasteful number, since it uses less digits than its factorization.

18019839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101869.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 18019839 is about 4244.9780918163. The cubic root of 18019839 is about 262.1703871961.

The spelling of 18019839 in words is "eighteen million, nineteen thousand, eight hundred thirty-nine".