1780625 has 40 divisors (see below), whose sum is σ = 2849088. Its totient is φ = 1080000.

The previous prime is 1780619. The next prime is 1780627. The reversal of 1780625 is 5260871.

It is not a de Polignac number, because 1780625 - 2¹⁰ = 1779601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 48107 + ... + 48143.

2^1780625 is an apocalyptic number.

It is an amenable number.

1780625 is a deficient number, since it is larger than the sum of its proper divisors (1068463).

1780625 is an equidigital number, since it uses as much as digits as its factorization.

1780625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1780625 is about 1334.4006145083. The cubic root of 1780625 is about 121.2060101875.

The spelling of 1780625 in words is "one million, seven hundred eighty thousand, six hundred twenty-five".