1283785 has 4 divisors (see below), whose sum is σ = 1540548. Its totient is φ = 1027024.

The previous prime is 1283771. The next prime is 1283797. The reversal of 1283785 is 5873821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5873821 = 457 ⋅12853.

It can be written as a sum of positive squares in 2 ways, for example, as 537289 + 746496 = 733^2 + 864^2 .

It is a cyclic number.

It is not a de Polignac number, because 1283785 - 2⁵ = 1283753 is a prime.

It is a Duffinian 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 1283785.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 128374 + ... + 128383.

It is an arithmetic number, because the mean of its divisors is an integer number (385137).

2^1283785 is an apocalyptic number.

It is an amenable number.

1283785 is a deficient number, since it is larger than the sum of its proper divisors (256763).

1283785 is an equidigital number, since it uses as much as digits as its factorization.

1283785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256762.

The product of its digits is 13440, while the sum is 34.

The square root of 1283785 is about 1133.0423646095. The cubic root of 1283785 is about 108.6836209176.

The spelling of 1283785 in words is "one million, two hundred eighty-three thousand, seven hundred eighty-five".