1280765 has 8 divisors (see below), whose sum is σ = 1586688. Its totient is φ = 991440.

The previous prime is 1280761. The next prime is 1280767. The reversal of 1280765 is 5670821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1280765 - 2² = 1280761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3977 + ... + 4286.

It is an arithmetic number, because the mean of its divisors is an integer number (198336).

2^1280765 is an apocalyptic number.

It is an amenable number.

1280765 is a deficient number, since it is larger than the sum of its proper divisors (305923).

1280765 is an equidigital number, since it uses as much as digits as its factorization.

1280765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8299.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 1280765 is about 1131.7088848286. The cubic root of 1280765 is about 108.5983308714.

The spelling of 1280765 in words is "one million, two hundred eighty thousand, seven hundred sixty-five".