1266255 has 24 divisors (see below), whose sum is σ = 2311920. Its totient is φ = 639360.

The previous prime is 1266247. The next prime is 1266259. The reversal of 1266255 is 5526621.

It is not a de Polignac number, because 1266255 - 2³ = 1266247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266259) 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 23 ways as a sum of consecutive naturals, for example, 115 + ... + 1595.

It is an arithmetic number, because the mean of its divisors is an integer number (96330).

2^1266255 is an apocalyptic number.

1266255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1266255 is a deficient number, since it is larger than the sum of its proper divisors (1045665).

1266255 is a wasteful number, since it uses less digits than its factorization.

1266255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 1508 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1266255 is about 1125.2799651642. The cubic root of 1266255 is about 108.1866627905.

It can be divided in two parts, 1266 and 255, that added together give a square (1521 = 39²).

The spelling of 1266255 in words is "one million, two hundred sixty-six thousand, two hundred fifty-five".