18839871 has 10 divisors (see below), whose sum is σ = 28143632. Its totient is φ = 12559860.

The previous prime is 18839867. The next prime is 18839917. The reversal of 18839871 is 17893881.

It is not a de Polignac number, because 18839871 - 2² = 18839867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18839861) 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 9 ways as a sum of consecutive naturals, for example, 116215 + ... + 116376.

Almost surely, 2^18839871 is an apocalyptic number.

18839871 is a deficient number, since it is larger than the sum of its proper divisors (9303761).

18839871 is an equidigital number, since it uses as much as digits as its factorization.

18839871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232603 (or 232594 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 18839871 is about 4340.4920228011. The cubic root of 18839871 is about 266.0884201126.

The spelling of 18839871 in words is "eighteen million, eight hundred thirty-nine thousand, eight hundred seventy-one".