18912839 has 8 divisors (see below), whose sum is σ = 20671632. Its totient is φ = 17160640.

The previous prime is 18912811. The next prime is 18912841. The reversal of 18912839 is 93821981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18912839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18912796 and 18912805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18912899) 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, 5867 + ... + 8499.

It is an arithmetic number, because the mean of its divisors is an integer number (2583954).

Almost surely, 2^18912839 is an apocalyptic number.

18912839 is a deficient number, since it is larger than the sum of its proper divisors (1758793).

18912839 is a wasteful number, since it uses less digits than its factorization.

18912839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3297.

The product of its digits is 31104, while the sum is 41.

The square root of 18912839 is about 4348.8893984557. The cubic root of 18912839 is about 266.4315032694.

The spelling of 18912839 in words is "eighteen million, nine hundred twelve thousand, eight hundred thirty-nine".