18689228 has 6 divisors (see below), whose sum is σ = 32706156. Its totient is φ = 9344612.

The previous prime is 18689227. The next prime is 18689233. The reversal of 18689228 is 82298681.

It is not an unprimeable number, because it can be changed into a prime (18689227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2336150 + ... + 2336157.

It is an arithmetic number, because the mean of its divisors is an integer number (5451026).

Almost surely, 2^18689228 is an apocalyptic number.

It is an amenable number.

18689228 is a deficient number, since it is larger than the sum of its proper divisors (14016928).

18689228 is a wasteful number, since it uses less digits than its factorization.

18689228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4672311 (or 4672309 counting only the distinct ones).

The product of its digits is 110592, while the sum is 44.

The square root of 18689228 is about 4323.1039774680. The cubic root of 18689228 is about 265.3773099223.

The spelling of 18689228 in words is "eighteen million, six hundred eighty-nine thousand, two hundred twenty-eight".