18190225 has 9 divisors (see below), whose sum is σ = 22582353. Its totient is φ = 14535120.

The previous prime is 18190223. The next prime is 18190241. The reversal of 18190225 is 52209181.

The square root of 18190225 is 4265.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 7273809 + 10916416 = 2697^2 + 3304^2 .

It is not a de Polignac number, because 18190225 - 2¹ = 18190223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18190193 and 18190202.

It is not an unprimeable number, because it can be changed into a prime (18190223) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20899 + ... + 21751.

Almost surely, 2^18190225 is an apocalyptic number.

18190225 is the 4265-th square number.

18190225 is the 2133-rd centered octagonal number.

It is an amenable number.

18190225 is a deficient number, since it is larger than the sum of its proper divisors (4392128).

18190225 is an frugal number, since it uses more digits than its factorization.

18190225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The cubic root of 18190225 is about 262.9941109102.

The spelling of 18190225 in words is "eighteen million, one hundred ninety thousand, two hundred twenty-five".