1312785 has 12 divisors (see below), whose sum is σ = 2275572. Its totient is φ = 700128.

The previous prime is 1312777. The next prime is 1312789. The reversal of 1312785 is 5872131.

It can be written as a sum of positive squares in 2 ways, for example, as 266256 + 1046529 = 516^2 + 1023^2 .

It is not a de Polignac number, because 1312785 - 2³ = 1312777 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14542 + ... + 14631.

It is an arithmetic number, because the mean of its divisors is an integer number (189631).

2^1312785 is an apocalyptic number.

1312785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1312785 is a deficient number, since it is larger than the sum of its proper divisors (962787).

1312785 is a wasteful number, since it uses less digits than its factorization.

1312785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29184 (or 29181 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1312785 is about 1145.7683011848. The cubic root of 1312785 is about 109.4959027678.

It can be divided in two parts, 131 and 2785, that added together give a square (2916 = 54²).

The spelling of 1312785 in words is "one million, three hundred twelve thousand, seven hundred eighty-five".