18683881 has 8 divisors (see below), whose sum is σ = 19010880. Its totient is φ = 18359472.

The previous prime is 18683857. The next prime is 18683893. The reversal of 18683881 is 18838681.

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

It is a cyclic number.

It is not a de Polignac number, because 18683881 - 2⁹ = 18683369 is a prime.

It is a super-2 number, since 2×18683881² = 698174818444322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18683831) 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, 18516 + ... + 19498.

It is an arithmetic number, because the mean of its divisors is an integer number (2376360).

Almost surely, 2^18683881 is an apocalyptic number.

It is an amenable number.

18683881 is a deficient number, since it is larger than the sum of its proper divisors (326999).

18683881 is an equidigital number, since it uses as much as digits as its factorization.

18683881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295.

The product of its digits is 73728, while the sum is 43.

The square root of 18683881 is about 4322.4855118323. The cubic root of 18683881 is about 265.3519993027.

The spelling of 18683881 in words is "eighteen million, six hundred eighty-three thousand, eight hundred eighty-one".