18425225 has 54 divisors (see below), whose sum is σ = 29102490. Its totient is φ = 11531520.

The previous prime is 18425221. The next prime is 18425261. The reversal of 18425225 is 52252481.

It can be written as a sum of positive squares in 9 ways, for example, as 14500864 + 3924361 = 3808^2 + 1981^2 .

It is not a de Polignac number, because 18425225 - 2² = 18425221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18425221) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 206981 + ... + 207069.

It is an arithmetic number, because the mean of its divisors is an integer number (538935).

Almost surely, 2^18425225 is an apocalyptic number.

It is an amenable number.

18425225 is a deficient number, since it is larger than the sum of its proper divisors (10677265).

18425225 is a wasteful number, since it uses less digits than its factorization.

18425225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 114 counting only the distinct ones).

The product of its digits is 6400, while the sum is 29.

The square root of 18425225 is about 4292.4614150858. The cubic root of 18425225 is about 264.1218111347.

The spelling of 18425225 in words is "eighteen million, four hundred twenty-five thousand, two hundred twenty-five".