18449228 has 24 divisors (see below), whose sum is σ = 38841600. Its totient is φ = 7490448.

The previous prime is 18449213. The next prime is 18449237. The reversal of 18449228 is 82294481.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 18449191 and 18449200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16808 + ... + 17871.

It is an arithmetic number, because the mean of its divisors is an integer number (1618400).

Almost surely, 2^18449228 is an apocalyptic number.

It is an amenable number.

18449228 is an abundant number, since it is smaller than the sum of its proper divisors (20392372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18449228 is a wasteful number, since it uses less digits than its factorization.

18449228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34709 (or 34707 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 18449228 is about 4295.2564533448. The cubic root of 18449228 is about 264.2364540559.

The spelling of 18449228 in words is "eighteen million, four hundred forty-nine thousand, two hundred twenty-eight".