1320705 has 24 divisors (see below), whose sum is σ = 2376192. Its totient is φ = 703728.

The previous prime is 1320667. The next prime is 1320721. The reversal of 1320705 is 5070231.

It is not a de Polignac number, because 1320705 - 2¹³ = 1312513 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672 + ... + 1758.

It is an arithmetic number, because the mean of its divisors is an integer number (99008).

2^1320705 is an apocalyptic number.

1320705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1320705 is a deficient number, since it is larger than the sum of its proper divisors (1055487).

1320705 is an equidigital number, since it uses as much as digits as its factorization.

1320705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1095 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 1320705 is about 1149.2193002208. The cubic root of 1320705 is about 109.7156568083.

Adding to 1320705 its reverse (5070231), we get a palindrome (6390936).

It can be divided in two parts, 1320 and 705, that added together give a square (2025 = 45²).

The spelling of 1320705 in words is "one million, three hundred twenty thousand, seven hundred five".