13815225 has 48 divisors (see below), whose sum is σ = 25762240. Its totient is φ = 7257600.

The previous prime is 13815209. The next prime is 13815229. The reversal of 13815225 is 52251831.

It is a happy number.

13815225 is a `hidden beast` number, since 138 + 1 + 522 + 5 = 666.

It is not a de Polignac number, because 13815225 - 2⁴ = 13815209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13815229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65370 + ... + 65580.

Almost surely, 2^13815225 is an apocalyptic number.

13815225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13815225 is a deficient number, since it is larger than the sum of its proper divisors (11947015).

13815225 is a wasteful number, since it uses less digits than its factorization.

13815225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 316 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 13815225 is about 3716.8837754226. The cubic root of 13815225 is about 239.9492080015.

The spelling of 13815225 in words is "thirteen million, eight hundred fifteen thousand, two hundred twenty-five".