1285866 has 12 divisors (see below), whose sum is σ = 2786082. Its totient is φ = 428616.

The previous prime is 1285859. The next prime is 1285871. The reversal of 1285866 is 6685821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 950625 + 335241 = 975^2 + 579^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1285866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35701 + ... + 35736.

2^1285866 is an apocalyptic number.

1285866 is an abundant number, since it is smaller than the sum of its proper divisors (1500216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1285866 is a wasteful number, since it uses less digits than its factorization.

1285866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71445 (or 71442 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1285866 is about 1133.9603167660. The cubic root of 1285866 is about 108.7423141615.

The spelling of 1285866 in words is "one million, two hundred eighty-five thousand, eight hundred sixty-six".