1265644 has 12 divisors (see below), whose sum is σ = 2311344. Its totient is φ = 605264.

The previous prime is 1265639. The next prime is 1265653. The reversal of 1265644 is 4465621.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6787 + ... + 6970.

It is an arithmetic number, because the mean of its divisors is an integer number (192612).

2^1265644 is an apocalyptic number.

It is an amenable number.

1265644 is a deficient number, since it is larger than the sum of its proper divisors (1045700).

1265644 is a wasteful number, since it uses less digits than its factorization.

1265644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13784 (or 13782 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 1265644 is about 1125.0084444128. The cubic root of 1265644 is about 108.1692590591.

It can be divided in two parts, 12 and 65644, that added together give a palindrome (65656).

The spelling of 1265644 in words is "one million, two hundred sixty-five thousand, six hundred forty-four".