1812225 has 24 divisors (see below), whose sum is σ = 3046432. Its totient is φ = 950400.

The previous prime is 1812199. The next prime is 1812227. The reversal of 1812225 is 5222181.

It is a happy number.

It is not a de Polignac number, because 1812225 - 2¹⁵ = 1779457 is a prime.

It is a Duffinian number.

1812225 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1812227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5310 + ... + 5640.

2^1812225 is an apocalyptic number.

1812225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1812225 is a deficient number, since it is larger than the sum of its proper divisors (1234207).

1812225 is a wasteful number, since it uses less digits than its factorization.

1812225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 412 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 1812225 is about 1346.1890654733. The cubic root of 1812225 is about 121.9188073944.

The spelling of 1812225 in words is "one million, eight hundred twelve thousand, two hundred twenty-five".