1287255 has 8 divisors (see below), whose sum is σ = 2059632. Its totient is φ = 686528.

The previous prime is 1287239. The next prime is 1287289. The reversal of 1287255 is 5527821.

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

It is a cyclic number.

It is not a de Polignac number, because 1287255 - 2⁴ = 1287239 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 42894 + ... + 42923.

It is an arithmetic number, because the mean of its divisors is an integer number (257454).

2^1287255 is an apocalyptic number.

1287255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1287255 is a deficient number, since it is larger than the sum of its proper divisors (772377).

1287255 is an equidigital number, since it uses as much as digits as its factorization.

1287255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85825.

The product of its digits is 5600, while the sum is 30.

The square root of 1287255 is about 1134.5726067555. The cubic root of 1287255 is about 108.7814547669.

The spelling of 1287255 in words is "one million, two hundred eighty-seven thousand, two hundred fifty-five".