1286555 has 4 divisors (see below), whose sum is σ = 1543872. Its totient is φ = 1029240.

The previous prime is 1286533. The next prime is 1286557. The reversal of 1286555 is 5556821.

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

It is not a de Polignac number, because 1286555 - 2⁶ = 1286491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1286557) 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, 128651 + ... + 128660.

It is an arithmetic number, because the mean of its divisors is an integer number (385968).

2^1286555 is an apocalyptic number.

1286555 is a deficient number, since it is larger than the sum of its proper divisors (257317).

1286555 is an equidigital number, since it uses as much as digits as its factorization.

1286555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257316.

The product of its digits is 12000, while the sum is 32.

The square root of 1286555 is about 1134.2640785990. The cubic root of 1286555 is about 108.7617330011.

The spelling of 1286555 in words is "one million, two hundred eighty-six thousand, five hundred fifty-five".