1285705 has 4 divisors (see below), whose sum is σ = 1542852. Its totient is φ = 1028560.

The previous prime is 1285703. The next prime is 1285717. The reversal of 1285705 is 5075821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 929296 + 356409 = 964^2 + 597^2 .

It is not a de Polignac number, because 1285705 - 2¹ = 1285703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1285703) 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 3 ways as a sum of consecutive naturals, for example, 128566 + ... + 128575.

It is an arithmetic number, because the mean of its divisors is an integer number (385713).

2^1285705 is an apocalyptic number.

It is an amenable number.

1285705 is a deficient number, since it is larger than the sum of its proper divisors (257147).

1285705 is an equidigital number, since it uses as much as digits as its factorization.

1285705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257146.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 1285705 is about 1133.8893244052. The cubic root of 1285705 is about 108.7377755229.

The spelling of 1285705 in words is "one million, two hundred eighty-five thousand, seven hundred five".