1266889 has 4 divisors (see below), whose sum is σ = 1364356. Its totient is φ = 1169424.

The previous prime is 1266883. The next prime is 1266893. The reversal of 1266889 is 9886621.

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 501264 + 765625 = 708^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 1266889 - 2⁷ = 1266761 is a prime.

It is a Duffinian number.

1266889 is a lucky number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48714 + ... + 48739.

It is an arithmetic number, because the mean of its divisors is an integer number (341089).

2^1266889 is an apocalyptic number.

It is an amenable number.

1266889 is a deficient number, since it is larger than the sum of its proper divisors (97467).

1266889 is an equidigital number, since it uses as much as digits as its factorization.

1266889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97466.

The product of its digits is 41472, while the sum is 40.

The square root of 1266889 is about 1125.5616375837. The cubic root of 1266889 is about 108.2047157366.

The spelling of 1266889 in words is "one million, two hundred sixty-six thousand, eight hundred eighty-nine".