1266289 has 4 divisors (see below), whose sum is σ = 1269360. Its totient is φ = 1263220.

The previous prime is 1266281. The next prime is 1266301. The reversal of 1266289 is 9826621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1266289 - 2³ = 1266281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266281) 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, 799 + ... + 1780.

It is an arithmetic number, because the mean of its divisors is an integer number (317340).

2^1266289 is an apocalyptic number.

It is an amenable number.

1266289 is a deficient number, since it is larger than the sum of its proper divisors (3071).

1266289 is an equidigital number, since it uses as much as digits as its factorization.

1266289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3070.

The product of its digits is 10368, while the sum is 34.

The square root of 1266289 is about 1125.2950724143. The cubic root of 1266289 is about 108.1876310825.

The spelling of 1266289 in words is "one million, two hundred sixty-six thousand, two hundred eighty-nine".