12157225 has 12 divisors (see below), whose sum is σ = 15731136. Its totient is φ = 9302480.

The previous prime is 12157219. The next prime is 12157237. The reversal of 12157225 is 52275121.

It is not a de Polignac number, because 12157225 - 2¹⁷ = 12026153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12157225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9997 + ... + 11146.

It is an arithmetic number, because the mean of its divisors is an integer number (1310928).

Almost surely, 2^12157225 is an apocalyptic number.

It is an amenable number.

12157225 is a deficient number, since it is larger than the sum of its proper divisors (3573911).

12157225 is a wasteful number, since it uses less digits than its factorization.

12157225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21176 (or 21171 counting only the distinct ones).

The product of its digits is 1400, while the sum is 25.

The square root of 12157225 is about 3486.7212392160. The cubic root of 12157225 is about 229.9383892948.

The spelling of 12157225 in words is "twelve million, one hundred fifty-seven thousand, two hundred twenty-five".