18784242 has 24 divisors (see below), whose sum is σ = 40779180. Its totient is φ = 6249120.

The previous prime is 18784231. The next prime is 18784247. The reversal of 18784242 is 24248781.

It can be written as a sum of positive squares in 2 ways, for example, as 17464041 + 1320201 = 4179^2 + 1149^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18784197 and 18784206.

It is not an unprimeable number, because it can be changed into a prime (18784247) 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, 16384 + ... + 17492.

Almost surely, 2^18784242 is an apocalyptic number.

18784242 is an abundant number, since it is smaller than the sum of its proper divisors (21994938).

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

18784242 is a wasteful number, since it uses less digits than its factorization.

18784242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058 (or 2055 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 18784242 is about 4334.0791409479. The cubic root of 18784242 is about 265.8262664129.

The spelling of 18784242 in words is "eighteen million, seven hundred eighty-four thousand, two hundred forty-two".