1326565 has 4 divisors (see below), whose sum is σ = 1591884. Its totient is φ = 1061248.

The previous prime is 1326551. The next prime is 1326587. The reversal of 1326565 is 5656231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 431649 + 894916 = 657^2 + 946^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326565 - 2⁹ = 1326053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132652 + ... + 132661.

It is an arithmetic number, because the mean of its divisors is an integer number (397971).

2^1326565 is an apocalyptic number.

It is an amenable number.

1326565 is a deficient number, since it is larger than the sum of its proper divisors (265319).

1326565 is an equidigital number, since it uses as much as digits as its factorization.

1326565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265318.

The product of its digits is 5400, while the sum is 28.

The square root of 1326565 is about 1151.7660352693. The cubic root of 1326565 is about 109.8776877392.

It can be divided in two parts, 1326 and 565, that added together give a triangular number (1891 = T₆₁).

The spelling of 1326565 in words is "one million, three hundred twenty-six thousand, five hundred sixty-five".