1285255 has 16 divisors (see below), whose sum is σ = 1653120. Its totient is φ = 956448.

The previous prime is 1285247. The next prime is 1285259. The reversal of 1285255 is 5525821.

1285255 = 505² + 506² + ... + 509².

It is a cyclic number.

It is not a de Polignac number, because 1285255 - 2³ = 1285247 is a prime.

1285255 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285259) 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 15 ways as a sum of consecutive naturals, for example, 7804 + ... + 7966.

It is an arithmetic number, because the mean of its divisors is an integer number (103320).

2^1285255 is an apocalyptic number.

1285255 is a deficient number, since it is larger than the sum of its proper divisors (367865).

1285255 is a wasteful number, since it uses less digits than its factorization.

1285255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270.

The product of its digits is 4000, while the sum is 28.

The square root of 1285255 is about 1133.6908749743. The cubic root of 1285255 is about 108.7250878771.

It can be divided in two parts, 1285 and 255, that added together give a triangular number (1540 = T₅₅).

The spelling of 1285255 in words is "one million, two hundred eighty-five thousand, two hundred fifty-five".