1815225 has 12 divisors (see below), whose sum is σ = 3001296. Its totient is φ = 968080.

The previous prime is 1815223. The next prime is 1815251. The reversal of 1815225 is 5225181.

It is not a de Polignac number, because 1815225 - 2¹ = 1815223 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1815195 and 1815204.

It is not an unprimeable number, because it can be changed into a prime (1815221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12027 + ... + 12176.

It is an arithmetic number, because the mean of its divisors is an integer number (250108).

2^1815225 is an apocalyptic number.

1815225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1815225 is a deficient number, since it is larger than the sum of its proper divisors (1186071).

1815225 is a wasteful number, since it uses less digits than its factorization.

1815225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24216 (or 24211 counting only the distinct ones).

The product of its digits is 800, while the sum is 24.

The square root of 1815225 is about 1347.3028612751. The cubic root of 1815225 is about 121.9860460615.

The spelling of 1815225 in words is "one million, eight hundred fifteen thousand, two hundred twenty-five".