1813225 has 24 divisors (see below), whose sum is σ = 2421720. Its totient is φ = 1344000.

The previous prime is 1813223. The next prime is 1813277. The reversal of 1813225 is 5223181.

It can be written as a sum of positive squares in 12 ways, for example, as 1449616 + 363609 = 1204^2 + 603^2 .

It is not a de Polignac number, because 1813225 - 2¹ = 1813223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1813196 and 1813205.

It is not an unprimeable number, because it can be changed into a prime (1813223) 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 23 ways as a sum of consecutive naturals, for example, 29695 + ... + 29755.

It is an arithmetic number, because the mean of its divisors is an integer number (100905).

2^1813225 is an apocalyptic number.

It is an amenable number.

1813225 is a deficient number, since it is larger than the sum of its proper divisors (608495).

1813225 is a wasteful number, since it uses less digits than its factorization.

1813225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 136 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 1813225 is about 1346.5604331035. The cubic root of 1813225 is about 121.9412285230.

The spelling of 1813225 in words is "one million, eight hundred thirteen thousand, two hundred twenty-five".