15120225 has 72 divisors (see below), whose sum is σ = 29596320. Its totient is φ = 7349760.

The previous prime is 15120187. The next prime is 15120227. The reversal of 15120225 is 52202151.

It is not a de Polignac number, because 15120225 - 2⁸ = 15119969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15120198 and 15120207.

It is not an unprimeable number, because it can be changed into a prime (15120227) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 225642 + ... + 225708.

It is an arithmetic number, because the mean of its divisors is an integer number (411060).

Almost surely, 2^15120225 is an apocalyptic number.

15120225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15120225 is a deficient number, since it is larger than the sum of its proper divisors (14476095).

15120225 is a wasteful number, since it uses less digits than its factorization.

15120225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 15120225 is about 3888.4733508152. The cubic root of 15120225 is about 247.2783445554.

Adding to 15120225 its reverse (52202151), we get a palindrome (67322376).

The spelling of 15120225 in words is "fifteen million, one hundred twenty thousand, two hundred twenty-five".