18881689 has 8 divisors (see below), whose sum is σ = 20184192. Its totient is φ = 17619360.

The previous prime is 18881683. The next prime is 18881693. The reversal of 18881689 is 98618881.

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 18881689 - 2⁵ = 18881657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18881683) 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, 9069 + ... + 10954.

It is an arithmetic number, because the mean of its divisors is an integer number (2523024).

Almost surely, 2^18881689 is an apocalyptic number.

It is an amenable number.

18881689 is a deficient number, since it is larger than the sum of its proper divisors (1302503).

18881689 is a wasteful number, since it uses less digits than its factorization.

18881689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20087.

The product of its digits is 221184, while the sum is 49.

The square root of 18881689 is about 4345.3065484497. The cubic root of 18881689 is about 266.2851493927.

The spelling of 18881689 in words is "eighteen million, eight hundred eighty-one thousand, six hundred eighty-nine".