1266643 has 4 divisors (see below), whose sum is σ = 1447600. Its totient is φ = 1085688.

The previous prime is 1266631. The next prime is 1266677. The reversal of 1266643 is 3466621.

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

It is a cyclic number.

It is not a de Polignac number, because 1266643 - 2⁵ = 1266611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1266043) 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, 90468 + ... + 90481.

It is an arithmetic number, because the mean of its divisors is an integer number (361900).

2^1266643 is an apocalyptic number.

1266643 is a deficient number, since it is larger than the sum of its proper divisors (180957).

1266643 is an equidigital number, since it uses as much as digits as its factorization.

1266643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180956.

The product of its digits is 5184, while the sum is 28.

The square root of 1266643 is about 1125.4523535006. The cubic root of 1266643 is about 108.1977116810.

The spelling of 1266643 in words is "one million, two hundred sixty-six thousand, six hundred forty-three".