1320885 has 24 divisors (see below), whose sum is σ = 2316600. Its totient is φ = 696192.

The previous prime is 1320881. The next prime is 1320887. The reversal of 1320885 is 5880231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 224676 + 1096209 = 474^2 + 1047^2 .

It is not a de Polignac number, because 1320885 - 2² = 1320881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320881) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 6607 + ... + 6803.

It is an arithmetic number, because the mean of its divisors is an integer number (96525).

2^1320885 is an apocalyptic number.

1320885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1320885 is a deficient number, since it is larger than the sum of its proper divisors (995715).

1320885 is a wasteful number, since it uses less digits than its factorization.

1320885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1320885 is about 1149.2976115872. The cubic root of 1320885 is about 109.7206409951.

The spelling of 1320885 in words is "one million, three hundred twenty thousand, eight hundred eighty-five".