1321760 has 48 divisors (see below), whose sum is σ = 3411072. Its totient is φ = 480000.

The previous prime is 1321759. The next prime is 1321763. The reversal of 1321760 is 671231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1321763) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1385 + ... + 2135.

It is an arithmetic number, because the mean of its divisors is an integer number (71064).

2^1321760 is an apocalyptic number.

1321760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1705536).

1321760 is an abundant number, since it is smaller than the sum of its proper divisors (2089312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321760 is a wasteful number, since it uses less digits than its factorization.

1321760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777 (or 769 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 1321760 is about 1149.6782158500. The cubic root of 1321760 is about 109.7448632323.

Adding to 1321760 its reverse (671231), we get a palindrome (1992991).

The spelling of 1321760 in words is "one million, three hundred twenty-one thousand, seven hundred sixty".