1286855 has 4 divisors (see below), whose sum is σ = 1544232. Its totient is φ = 1029480.

The previous prime is 1286843. The next prime is 1286881. The reversal of 1286855 is 5586821.

It is a happy number.

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

It is not a de Polignac number, because 1286855 - 2⁴ = 1286839 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 128681 + ... + 128690.

It is an arithmetic number, because the mean of its divisors is an integer number (386058).

2^1286855 is an apocalyptic number.

1286855 is a deficient number, since it is larger than the sum of its proper divisors (257377).

1286855 is an equidigital number, since it uses as much as digits as its factorization.

1286855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257376.

The product of its digits is 19200, while the sum is 35.

The square root of 1286855 is about 1134.3963152267. The cubic root of 1286855 is about 108.7701860622.

The spelling of 1286855 in words is "one million, two hundred eighty-six thousand, eight hundred fifty-five".