18225784 has 16 divisors (see below), whose sum is σ = 34218720. Its totient is φ = 9100800.

The previous prime is 18225761. The next prime is 18225787. The reversal of 18225784 is 48752281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18225787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10584 + ... + 12184.

It is an arithmetic number, because the mean of its divisors is an integer number (2138670).

Almost surely, 2^18225784 is an apocalyptic number.

It is an amenable number.

18225784 is a deficient number, since it is larger than the sum of its proper divisors (15992936).

18225784 is a wasteful number, since it uses less digits than its factorization.

18225784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030 (or 3026 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 18225784 is about 4269.1666634134. The cubic root of 18225784 is about 263.1653699322.

It can be divided in two parts, 18225 and 784, that multiplied together give a square (14288400 = 3780²).

The spelling of 18225784 in words is "eighteen million, two hundred twenty-five thousand, seven hundred eighty-four".