18828839 has 4 divisors (see below), whose sum is σ = 18895656. Its totient is φ = 18762024.

The previous prime is 18828827. The next prime is 18828841. The reversal of 18828839 is 93882881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93882881 = 457 ⋅205433.

It is a cyclic number.

It is not a de Polignac number, because 18828839 - 2²⁰ = 17780263 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18828793 and 18828802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18828889) 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, 32984 + ... + 33549.

It is an arithmetic number, because the mean of its divisors is an integer number (4723914).

Almost surely, 2^18828839 is an apocalyptic number.

18828839 is a deficient number, since it is larger than the sum of its proper divisors (66817).

18828839 is an equidigital number, since it uses as much as digits as its factorization.

18828839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66816.

The product of its digits is 221184, while the sum is 47.

The square root of 18828839 is about 4339.2210130391. The cubic root of 18828839 is about 266.0364724707.

The spelling of 18828839 in words is "eighteen million, eight hundred twenty-eight thousand, eight hundred thirty-nine".