1285986 has 16 divisors (see below), whose sum is σ = 2769984. Its totient is φ = 395664.

The previous prime is 1285981. The next prime is 1285993. The reversal of 1285986 is 6895821.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1285981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8166 + ... + 8321.

It is an arithmetic number, because the mean of its divisors is an integer number (173124).

2^1285986 is an apocalyptic number.

1285986 is an abundant number, since it is smaller than the sum of its proper divisors (1483998).

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

1285986 is a wasteful number, since it uses less digits than its factorization.

1285986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16505.

The product of its digits is 34560, while the sum is 39.

The square root of 1285986 is about 1134.0132274361. The cubic root of 1285986 is about 108.7456967514.

The spelling of 1285986 in words is "one million, two hundred eighty-five thousand, nine hundred eighty-six".