1285984 has 24 divisors (see below), whose sum is σ = 2893968. Its totient is φ = 551040.

The previous prime is 1285981. The next prime is 1285993. The reversal of 1285984 is 4895821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285981) 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, 2647 + ... + 3094.

It is an arithmetic number, because the mean of its divisors is an integer number (120582).

2^1285984 is an apocalyptic number.

1285984 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1285984 is an abundant number, since it is smaller than the sum of its proper divisors (1607984).

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

1285984 is an equidigital number, since it uses as much as digits as its factorization.

1285984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5758 (or 5750 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 1285984 is about 1134.0123456118. The cubic root of 1285984 is about 108.7456403766.

The spelling of 1285984 in words is "one million, two hundred eighty-five thousand, nine hundred eighty-four".