1266855 has 8 divisors (see below), whose sum is σ = 2026992. Its totient is φ = 675648.

The previous prime is 1266851. The next prime is 1266869. The reversal of 1266855 is 5586621.

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

It is not a de Polignac number, because 1266855 - 2² = 1266851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266851) 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 7 ways as a sum of consecutive naturals, for example, 42214 + ... + 42243.

It is an arithmetic number, because the mean of its divisors is an integer number (253374).

2^1266855 is an apocalyptic number.

1266855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1266855 is a deficient number, since it is larger than the sum of its proper divisors (760137).

1266855 is an equidigital number, since it uses as much as digits as its factorization.

1266855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84465.

The product of its digits is 14400, while the sum is 33.

The square root of 1266855 is about 1125.5465339114. The cubic root of 1266855 is about 108.2037477504.

The spelling of 1266855 in words is "one million, two hundred sixty-six thousand, eight hundred fifty-five".