1285812 has 72 divisors (see below), whose sum is σ = 3773952. Its totient is φ = 364800.

The previous prime is 1285811. The next prime is 1285813. The reversal of 1285812 is 2185821.

It is an interprime number because it is at equal distance from previous prime (1285811) and next prime (1285813).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6637 + ... + 6827.

It is an arithmetic number, because the mean of its divisors is an integer number (52416).

2^1285812 is an apocalyptic number.

1285812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1886976).

1285812 is an abundant number, since it is smaller than the sum of its proper divisors (2488140).

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

1285812 is a wasteful number, since it uses less digits than its factorization.

1285812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 224 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 1285812 is about 1133.9365061590. The cubic root of 1285812 is about 108.7407919275.

Subtracting 1285812 from its reverse (2185821), we obtain a palindrome (900009).

The spelling of 1285812 in words is "one million, two hundred eighty-five thousand, eight hundred twelve".