1265803 has 16 divisors (see below), whose sum is σ = 1672704. Its totient is φ = 927360.

The previous prime is 1265801. The next prime is 1265813. The reversal of 1265803 is 3085621.

It is a happy number.

It is not a de Polignac number, because 1265803 - 2¹ = 1265801 is a prime.

1265803 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1265801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 826 + ... + 1792.

It is an arithmetic number, because the mean of its divisors is an integer number (104544).

2^1265803 is an apocalyptic number.

1265803 is a deficient number, since it is larger than the sum of its proper divisors (406901).

1265803 is a wasteful number, since it uses less digits than its factorization.

1265803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1265803 is about 1125.0791083297. The cubic root of 1265803 is about 108.1737885561.

It can be divided in two parts, 126 and 5803, that added together give a square (5929 = 77²).

The spelling of 1265803 in words is "one million, two hundred sixty-five thousand, eight hundred three".