18983881 has 8 divisors (see below), whose sum is σ = 21800384. Its totient is φ = 16193520.

The previous prime is 18983863. The next prime is 18983891. The reversal of 18983881 is 18838981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18983881 - 2¹⁷ = 18852809 is a prime.

It is a super-2 number, since 2×18983881² = 720775475644322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18983801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4950 + ... + 7903.

It is an arithmetic number, because the mean of its divisors is an integer number (2725048).

Almost surely, 2^18983881 is an apocalyptic number.

It is an amenable number.

18983881 is a deficient number, since it is larger than the sum of its proper divisors (2816503).

18983881 is a wasteful number, since it uses less digits than its factorization.

18983881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13071.

The product of its digits is 110592, while the sum is 46.

The square root of 18983881 is about 4357.0495751139. The cubic root of 18983881 is about 266.7646839332.

The spelling of 18983881 in words is "eighteen million, nine hundred eighty-three thousand, eight hundred eighty-one".