1280565 has 48 divisors (see below), whose sum is σ = 2620800. Its totient is φ = 570240.

The previous prime is 1280561. The next prime is 1280567. The reversal of 1280565 is 5650821.

It is not a de Polignac number, because 1280565 - 2² = 1280561 is a prime.

Together with 1340235 it forms an amicable pair .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280561) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6336 + ... + 6534.

It is an arithmetic number, because the mean of its divisors is an integer number (54600).

2^1280565 is an apocalyptic number.

1280565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1280565 is an abundant number, since it is smaller than the sum of its proper divisors (1340235).

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

1280565 is a wasteful number, since it uses less digits than its factorization.

1280565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1280565 is about 1131.6205194322. The cubic root of 1280565 is about 108.5926777925.

The spelling of 1280565 in words is "one million, two hundred eighty thousand, five hundred sixty-five".