1280867 has 4 divisors (see below), whose sum is σ = 1463856. Its totient is φ = 1097880.

The previous prime is 1280863. The next prime is 1280869. The reversal of 1280867 is 7680821.

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

It is not a de Polignac number, because 1280867 - 2² = 1280863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280863) 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, 91484 + ... + 91497.

It is an arithmetic number, because the mean of its divisors is an integer number (365964).

2^1280867 is an apocalyptic number.

1280867 is a deficient number, since it is larger than the sum of its proper divisors (182989).

1280867 is an equidigital number, since it uses as much as digits as its factorization.

1280867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182988.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 1280867 is about 1131.7539485241. The cubic root of 1280867 is about 108.6012137150.

The spelling of 1280867 in words is "one million, two hundred eighty thousand, eight hundred sixty-seven".