1320655 has 16 divisors (see below), whose sum is σ = 1834560. Its totient is φ = 893952.

The previous prime is 1320623. The next prime is 1320667. The reversal of 1320655 is 5560231.

It is a happy number.

It is not a de Polignac number, because 1320655 - 2⁵ = 1320623 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 3201 + ... + 3589.

It is an arithmetic number, because the mean of its divisors is an integer number (114660).

2^1320655 is an apocalyptic number.

1320655 is a deficient number, since it is larger than the sum of its proper divisors (513905).

1320655 is an equidigital number, since it uses as much as digits as its factorization.

1320655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 1320655 is about 1149.1975461164. The cubic root of 1320655 is about 109.7142722317.

Adding to 1320655 its reverse (5560231), we get a palindrome (6880886).

The spelling of 1320655 in words is "one million, three hundred twenty thousand, six hundred fifty-five".