1266905 has 4 divisors (see below), whose sum is σ = 1520292. Its totient is φ = 1013520.

The previous prime is 1266899. The next prime is 1266913. The reversal of 1266905 is 5096621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 375769 + 891136 = 613^2 + 944^2 .

It is not a de Polignac number, because 1266905 - 2⁶ = 1266841 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 126686 + ... + 126695.

It is an arithmetic number, because the mean of its divisors is an integer number (380073).

2^1266905 is an apocalyptic number.

It is an amenable number.

1266905 is a deficient number, since it is larger than the sum of its proper divisors (253387).

1266905 is an equidigital number, since it uses as much as digits as its factorization.

1266905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253386.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 1266905 is about 1125.5687451240. The cubic root of 1266905 is about 108.2051712536.

The spelling of 1266905 in words is "one million, two hundred sixty-six thousand, nine hundred five".