1266543 has 16 divisors (see below), whose sum is σ = 1909600. Its totient is φ = 829440.

The previous prime is 1266539. The next prime is 1266557. The reversal of 1266543 is 3456621.

1266543 is a `hidden beast` number, since 1 + 2 + 6 + 654 + 3 = 666.

It is not a de Polignac number, because 1266543 - 2² = 1266539 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1263 + ... + 2031.

It is an arithmetic number, because the mean of its divisors is an integer number (119350).

2^1266543 is an apocalyptic number.

1266543 is a deficient number, since it is larger than the sum of its proper divisors (643057).

1266543 is an equidigital number, since it uses as much as digits as its factorization.

1266543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839 (or 833 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1266543 is about 1125.4079260428. The cubic root of 1266543 is about 108.1948642446.

The spelling of 1266543 in words is "one million, two hundred sixty-six thousand, five hundred forty-three".