18929228 has 36 divisors (see below), whose sum is σ = 36435672. Its totient is φ = 8574720.

The previous prime is 18929227. The next prime is 18929231. The reversal of 18929228 is 82292981.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18929227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57023 + ... + 57353.

It is an arithmetic number, because the mean of its divisors is an integer number (1012102).

Almost surely, 2^18929228 is an apocalyptic number.

It is an amenable number.

18929228 is a deficient number, since it is larger than the sum of its proper divisors (17506444).

18929228 is a wasteful number, since it uses less digits than its factorization.

18929228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 379 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 18929228 is about 4350.7732646048. The cubic root of 18929228 is about 266.5084401627.

The spelling of 18929228 in words is "eighteen million, nine hundred twenty-nine thousand, two hundred twenty-eight".