18644225 has 12 divisors (see below), whose sum is σ = 24336240. Its totient is φ = 14130000.

The previous prime is 18644203. The next prime is 18644233. The reversal of 18644225 is 52244681.

It is not a de Polignac number, because 18644225 - 2¹⁴ = 18627841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18644191 and 18644200.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 19151 + ... + 20100.

It is an arithmetic number, because the mean of its divisors is an integer number (2028020).

Almost surely, 2^18644225 is an apocalyptic number.

It is an amenable number.

18644225 is a deficient number, since it is larger than the sum of its proper divisors (5692015).

18644225 is a wasteful number, since it uses less digits than its factorization.

18644225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39280 (or 39275 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 18644225 is about 4317.8958996252. The cubic root of 18644225 is about 265.1641323305.

The spelling of 18644225 in words is "eighteen million, six hundred forty-four thousand, two hundred twenty-five".