1780925 has 6 divisors (see below), whose sum is σ = 2208378. Its totient is φ = 1424720.

The previous prime is 1780901. The next prime is 1780939. The reversal of 1780925 is 5290871.

It can be written as a sum of positive squares in 3 ways, for example, as 1369 + 1779556 = 37^2 + 1334^2 .

It is not a de Polignac number, because 1780925 - 2¹⁴ = 1764541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1780891 and 1780900.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 35594 + ... + 35643.

It is an arithmetic number, because the mean of its divisors is an integer number (368063).

2^1780925 is an apocalyptic number.

It is an amenable number.

1780925 is a deficient number, since it is larger than the sum of its proper divisors (427453).

1780925 is an equidigital number, since it uses as much as digits as its factorization.

1780925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71247 (or 71242 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 1780925 is about 1334.5130197941. The cubic root of 1780925 is about 121.2128167416.

The spelling of 1780925 in words is "one million, seven hundred eighty thousand, nine hundred twenty-five".