18899983 has 6 divisors (see below), whose sum is σ = 19035416. Its totient is φ = 18765432.

The previous prime is 18899981. The next prime is 18899989. The reversal of 18899983 is 38999881.

It is not a de Polignac number, because 18899983 - 2¹ = 18899981 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 (18899981) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38566 + ... + 39052.

Almost surely, 2^18899983 is an apocalyptic number.

18899983 is a deficient number, since it is larger than the sum of its proper divisors (135433).

18899983 is an frugal number, since it uses more digits than its factorization.

18899983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 684 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 55.

The square root of 18899983 is about 4347.4110686706. The cubic root of 18899983 is about 266.3711206584.

The spelling of 18899983 in words is "eighteen million, eight hundred ninety-nine thousand, nine hundred eighty-three".