18239225 has 6 divisors (see below), whose sum is σ = 22616670. Its totient is φ = 14591360.

The previous prime is 18239213. The next prime is 18239227. The reversal of 18239225 is 52293281.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1893376 + 16345849 = 1376^2 + 4043^2 .

It is not a de Polignac number, because 18239225 - 2¹⁶ = 18173689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18239191 and 18239200.

It is not an unprimeable number, because it can be changed into a prime (18239227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364760 + ... + 364809.

It is an arithmetic number, because the mean of its divisors is an integer number (3769445).

Almost surely, 2^18239225 is an apocalyptic number.

It is an amenable number.

18239225 is a deficient number, since it is larger than the sum of its proper divisors (4377445).

18239225 is an equidigital number, since it uses as much as digits as its factorization.

18239225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729579 (or 729574 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 18239225 is about 4270.7405680982. The cubic root of 18239225 is about 263.2300463738.

The spelling of 18239225 in words is "eighteen million, two hundred thirty-nine thousand, two hundred twenty-five".