1780085 has 12 divisors (see below), whose sum is σ = 2236332. Its totient is φ = 1360128.

The previous prime is 1780081. The next prime is 1780099. The reversal of 1780085 is 5800871.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 611524 + 1168561 = 782^2 + 1081^2 .

It is not a de Polignac number, because 1780085 - 2² = 1780081 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1780081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2309 + ... + 2981.

It is an arithmetic number, because the mean of its divisors is an integer number (186361).

2^1780085 is an apocalyptic number.

It is an amenable number.

1780085 is a deficient number, since it is larger than the sum of its proper divisors (456247).

1780085 is an equidigital number, since it uses as much as digits as its factorization.

1780085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1780085 is about 1334.1982611291. The cubic root of 1780085 is about 121.1937564633.

The spelling of 1780085 in words is "one million, seven hundred eighty thousand, eighty-five".