1285885 has 4 divisors (see below), whose sum is σ = 1543068. Its totient is φ = 1028704.

The previous prime is 1285877. The next prime is 1285891. The reversal of 1285885 is 5885821.

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 375769 + 910116 = 613^2 + 954^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285885 - 2³ = 1285877 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128584 + ... + 128593.

It is an arithmetic number, because the mean of its divisors is an integer number (385767).

2^1285885 is an apocalyptic number.

It is an amenable number.

1285885 is a deficient number, since it is larger than the sum of its proper divisors (257183).

1285885 is an equidigital number, since it uses as much as digits as its factorization.

1285885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257182.

The product of its digits is 25600, while the sum is 37.

The square root of 1285885 is about 1133.9686944532. The cubic root of 1285885 is about 108.7428497523.

The spelling of 1285885 in words is "one million, two hundred eighty-five thousand, eight hundred eighty-five".