1320685 has 4 divisors (see below), whose sum is σ = 1584828. Its totient is φ = 1056544.

The previous prime is 1320667. The next prime is 1320721. The reversal of 1320685 is 5860231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5860231 = 13 ⋅450787.

It can be written as a sum of positive squares in 2 ways, for example, as 499849 + 820836 = 707^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320685 - 2⁹ = 1320173 is a prime.

It is a Duffinian number.

1320685 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132064 + ... + 132073.

It is an arithmetic number, because the mean of its divisors is an integer number (396207).

2^1320685 is an apocalyptic number.

It is an amenable number.

1320685 is a deficient number, since it is larger than the sum of its proper divisors (264143).

1320685 is an equidigital number, since it uses as much as digits as its factorization.

1320685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264142.

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

The square root of 1320685 is about 1149.2105986285. The cubic root of 1320685 is about 109.7151029819.

The spelling of 1320685 in words is "one million, three hundred twenty thousand, six hundred eighty-five".