1266845 has 4 divisors (see below), whose sum is σ = 1520220. Its totient is φ = 1013472.

The previous prime is 1266841. The next prime is 1266847. The reversal of 1266845 is 5486621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5486621 = 7 ⋅783803.

It can be written as a sum of positive squares in 2 ways, for example, as 228484 + 1038361 = 478^2 + 1019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266845 - 2² = 1266841 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266841) 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 3 ways as a sum of consecutive naturals, for example, 126680 + ... + 126689.

It is an arithmetic number, because the mean of its divisors is an integer number (380055).

2^1266845 is an apocalyptic number.

It is an amenable number.

1266845 is a deficient number, since it is larger than the sum of its proper divisors (253375).

1266845 is an equidigital number, since it uses as much as digits as its factorization.

1266845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253374.

The product of its digits is 11520, while the sum is 32.

The square root of 1266845 is about 1125.5420916163. The cubic root of 1266845 is about 108.2034630453.

The spelling of 1266845 in words is "one million, two hundred sixty-six thousand, eight hundred forty-five".