18739228 has 12 divisors (see below), whose sum is σ = 33556600. Its totient is φ = 9151632.

The previous prime is 18739223. The next prime is 18739241. The reversal of 18739228 is 82293781.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18739223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54303 + ... + 54646.

Almost surely, 2^18739228 is an apocalyptic number.

It is an amenable number.

18739228 is a deficient number, since it is larger than the sum of its proper divisors (14817372).

18739228 is a wasteful number, since it uses less digits than its factorization.

18739228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108996 (or 108994 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 18739228 is about 4328.8829968018. The cubic root of 18739228 is about 265.6137571804.

The spelling of 18739228 in words is "eighteen million, seven hundred thirty-nine thousand, two hundred twenty-eight".