18804839 has 4 divisors (see below), whose sum is σ = 19911024. Its totient is φ = 17698656.

The previous prime is 18804833. The next prime is 18804853. The reversal of 18804839 is 93840881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93840881 = 1657 ⋅56633.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18804839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18804796 and 18804805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18804833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553067 + ... + 553100.

It is an arithmetic number, because the mean of its divisors is an integer number (4977756).

Almost surely, 2^18804839 is an apocalyptic number.

18804839 is a deficient number, since it is larger than the sum of its proper divisors (1106185).

18804839 is a wasteful number, since it uses less digits than its factorization.

18804839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106184.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 18804839 is about 4336.4546578974. The cubic root of 18804839 is about 265.9233907938.

The spelling of 18804839 in words is "eighteen million, eight hundred four thousand, eight hundred thirty-nine".