1265805 has 24 divisors (see below), whose sum is σ = 2291328. Its totient is φ = 645216.

The previous prime is 1265801. The next prime is 1265813. The reversal of 1265805 is 5085621.

1265805 is a `hidden beast` number, since 1 + 2 + 658 + 0 + 5 = 666.

It is not a de Polignac number, because 1265805 - 2² = 1265801 is a prime.

It is a Curzon number.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 424 + ... + 1646.

It is an arithmetic number, because the mean of its divisors is an integer number (95472).

2^1265805 is an apocalyptic number.

1265805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265805 is a deficient number, since it is larger than the sum of its proper divisors (1025523).

1265805 is a wasteful number, since it uses less digits than its factorization.

1265805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257 (or 1254 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 1265805 is about 1125.0799971558. The cubic root of 1265805 is about 108.1738455284.

The spelling of 1265805 in words is "one million, two hundred sixty-five thousand, eight hundred five".