1320865 has 16 divisors (see below), whose sum is σ = 1951488. Its totient is φ = 835776.

The previous prime is 1320859. The next prime is 1320871. The reversal of 1320865 is 5680231.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1320859) and next prime (1320871).

It is a cyclic number.

It is not a de Polignac number, because 1320865 - 2⁹ = 1320353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 997 + ... + 1906.

It is an arithmetic number, because the mean of its divisors is an integer number (121968).

2^1320865 is an apocalyptic number.

It is an amenable number.

1320865 is a deficient number, since it is larger than the sum of its proper divisors (630623).

1320865 is a wasteful number, since it uses less digits than its factorization.

1320865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2928.

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

The square root of 1320865 is about 1149.2889105878. The cubic root of 1320865 is about 109.7200872189.

The spelling of 1320865 in words is "one million, three hundred twenty thousand, eight hundred sixty-five".