1280636 has 12 divisors (see below), whose sum is σ = 2561328. Its totient is φ = 548832.

The previous prime is 1280633. The next prime is 1280651. The reversal of 1280636 is 6360821.

1280636 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280633) 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, 22841 + ... + 22896.

It is an arithmetic number, because the mean of its divisors is an integer number (213444).

2^1280636 is an apocalyptic number.

It is an amenable number.

1280636 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1280636 is a wasteful number, since it uses less digits than its factorization.

1280636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45748 (or 45746 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1280636 is about 1131.6518899379. The cubic root of 1280636 is about 108.5946847029.

The spelling of 1280636 in words is "one million, two hundred eighty thousand, six hundred thirty-six".