1320720 has 40 divisors (see below), whose sum is σ = 4094976. Its totient is φ = 352128.

The previous prime is 1320667. The next prime is 1320721. The reversal of 1320720 is 270231.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1320720.

It is not an unprimeable number, because it can be changed into a prime (1320721) 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, 2512 + ... + 2991.

2^1320720 is an apocalyptic number.

1320720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320720 is an abundant number, since it is smaller than the sum of its proper divisors (2774256).

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

1320720 is a wasteful number, since it uses less digits than its factorization.

1320720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5519 (or 5513 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 1320720 is about 1149.2258263718. The cubic root of 1320720 is about 109.7160721745.

Adding to 1320720 its reverse (270231), we get a palindrome (1590951).

The spelling of 1320720 in words is "one million, three hundred twenty thousand, seven hundred twenty".