1780225 has 6 divisors (see below), whose sum is σ = 2207510. Its totient is φ = 1424160.

The previous prime is 1780201. The next prime is 1780231. The reversal of 1780225 is 5220871.

It can be written as a sum of positive squares in 3 ways, for example, as 16641 + 1763584 = 129^2 + 1328^2 .

It is not a de Polignac number, because 1780225 - 2¹¹ = 1778177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 71209 = 1780225 / (1 + 7 + 8 + 0 + 2 + 2 + 5).

1780225 is a lucky number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 1780225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35580 + ... + 35629.

2^1780225 is an apocalyptic number.

It is an amenable number.

1780225 is a deficient number, since it is larger than the sum of its proper divisors (427285).

1780225 is an equidigital number, since it uses as much as digits as its factorization.

1780225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71219 (or 71214 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 1780225 is about 1334.2507260631. The cubic root of 1780225 is about 121.1969335927.

The spelling of 1780225 in words is "one million, seven hundred eighty thousand, two hundred twenty-five".