1280865507 has 4 divisors (see below), whose sum is σ = 1707820680. Its totient is φ = 853910336.

The previous prime is 1280865437. The next prime is 1280865529. The reversal of 1280865507 is 7055680821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1280865507 - 2²⁰ = 1279816931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1280865577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213477582 + ... + 213477587.

It is an arithmetic number, because the mean of its divisors is an integer number (426955170).

Almost surely, 2^1280865507 is an apocalyptic number.

1280865507 is a deficient number, since it is larger than the sum of its proper divisors (426955173).

1280865507 is an equidigital number, since it uses as much as digits as its factorization.

1280865507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426955172.

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 1280865507 is about 35789.1814240002. The cubic root of 1280865507 is about 1086.0117151923.

The spelling of 1280865507 in words is "one billion, two hundred eighty million, eight hundred sixty-five thousand, five hundred seven".