18021883 has 4 divisors (see below), whose sum is σ = 19660248. Its totient is φ = 16383520.

The previous prime is 18021841. The next prime is 18021889. The reversal of 18021883 is 38812081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18021883 - 2⁹ = 18021371 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18021889) 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 3 ways as a sum of consecutive naturals, for example, 819166 + ... + 819187.

It is an arithmetic number, because the mean of its divisors is an integer number (4915062).

Almost surely, 2^18021883 is an apocalyptic number.

18021883 is a deficient number, since it is larger than the sum of its proper divisors (1638365).

18021883 is a wasteful number, since it uses less digits than its factorization.

18021883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638364.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 18021883 is about 4245.2188400600. The cubic root of 18021883 is about 262.1802995305.

The spelling of 18021883 in words is "eighteen million, twenty-one thousand, eight hundred eighty-three".