1266503 has 6 divisors (see below), whose sum is σ = 1473336. Its totient is φ = 1085532.

The previous prime is 1266493. The next prime is 1266511. The reversal of 1266503 is 3056621.

It is not a de Polignac number, because 1266503 - 2⁴ = 1266487 is a prime.

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 (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12875 + ... + 12972.

It is an arithmetic number, because the mean of its divisors is an integer number (245556).

2^1266503 is an apocalyptic number.

1266503 is a deficient number, since it is larger than the sum of its proper divisors (206833).

1266503 is an equidigital number, since it uses as much as digits as its factorization.

1266503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25861 (or 25854 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1266503 is about 1125.3901545686. The cubic root of 1266503 is about 108.1937252281.

The spelling of 1266503 in words is "one million, two hundred sixty-six thousand, five hundred three".