1285686 has 32 divisors (see below), whose sum is σ = 2959200. Its totient is φ = 413280.

The previous prime is 1285679. The next prime is 1285699. The reversal of 1285686 is 6865821.

It is a happy 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 1285686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1156 + ... + 1976.

It is an arithmetic number, because the mean of its divisors is an integer number (92475).

2^1285686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1479600).

1285686 is an abundant number, since it is smaller than the sum of its proper divisors (1673514).

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

1285686 is a wasteful number, since it uses less digits than its factorization.

1285686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 855 counting only the distinct ones).

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

The square root of 1285686 is about 1133.8809461315. The cubic root of 1285686 is about 108.7372398822.

The spelling of 1285686 in words is "one million, two hundred eighty-five thousand, six hundred eighty-six".