1820225 has 12 divisors (see below), whose sum is σ = 2462640. Its totient is φ = 1323600.

The previous prime is 1820213. The next prime is 1820237. The reversal of 1820225 is 5220281.

It is an interprime number because it is at equal distance from previous prime (1820213) and next prime (1820237).

It is a de Polignac number, because none of the positive numbers 2^k-1820225 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1820197 and 1820206.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3035 + ... + 3584.

It is an arithmetic number, because the mean of its divisors is an integer number (205220).

2^1820225 is an apocalyptic number.

It is an amenable number.

1820225 is a deficient number, since it is larger than the sum of its proper divisors (642415).

1820225 is a wasteful number, since it uses less digits than its factorization.

1820225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6640 (or 6635 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1820225 is about 1349.1571442942. The cubic root of 1820225 is about 122.0979460688.

The spelling of 1820225 in words is "one million, eight hundred twenty thousand, two hundred twenty-five".