1266555 has 8 divisors (see below), whose sum is σ = 2026512. Its totient is φ = 675488.

The previous prime is 1266539. The next prime is 1266557. The reversal of 1266555 is 5556621.

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 1266555 - 2⁴ = 1266539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1266557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42204 + ... + 42233.

It is an arithmetic number, because the mean of its divisors is an integer number (253314).

2^1266555 is an apocalyptic number.

1266555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1266555 is a deficient number, since it is larger than the sum of its proper divisors (759957).

1266555 is an equidigital number, since it uses as much as digits as its factorization.

1266555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84445.

The product of its digits is 9000, while the sum is 30.

The square root of 1266555 is about 1125.4132574304. The cubic root of 1266555 is about 108.1952059449.

It can be divided in two parts, 12665 and 55, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 1266555 in words is "one million, two hundred sixty-six thousand, five hundred fifty-five".