7209225 has 27 divisors (see below), whose sum is σ = 12985063. Its totient is φ = 3823440.

The previous prime is 7209211. The next prime is 7209229. The reversal of 7209225 is 5229027.

It is a happy number.

The square root of 7209225 is 2685.

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

It can be written as a sum of positive squares in only one way, i.e., 2595321 + 4613904 = 1611^2 + 2148^2 .

It is not a de Polignac number, because 7209225 - 2¹⁵ = 7176457 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (7209229) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 40186 + ... + 40364.

Almost surely, 2^7209225 is an apocalyptic number.

7209225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

7209225 is the 2685-th square number.

7209225 is the 1343-rd centered octagonal number.

It is an amenable number.

7209225 is a deficient number, since it is larger than the sum of its proper divisors (5775838).

7209225 is a wasteful number, since it uses less digits than its factorization.

7209225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The cubic root of 7209225 is about 193.1803106100.

The spelling of 7209225 in words is "seven million, two hundred nine thousand, two hundred twenty-five".