1320120040 has 128 divisors (see below), whose sum is σ = 3279916800. Its totient is φ = 476098560.

The previous prime is 1320119951. The next prime is 1320120047. The reversal of 1320120040 is 400210231.

It is a self number, because there is not a number n which added to its sum of digits gives 1320120040.

It is not an unprimeable number, because it can be changed into a prime (1320120047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1785991 + ... + 1786729.

It is an arithmetic number, because the mean of its divisors is an integer number (25624350).

Almost surely, 2^1320120040 is an apocalyptic number.

1320120040 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 1320120040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1639958400).

1320120040 is an abundant number, since it is smaller than the sum of its proper divisors (1959796760).

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

1320120040 is a wasteful number, since it uses less digits than its factorization.

1320120040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 871 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1320120040 is about 36333.4562077433. The cubic root of 1320120040 is about 1096.9945618108.

Adding to 1320120040 its reverse (400210231), we get a palindrome (1720330271).

The spelling of 1320120040 in words is "one billion, three hundred twenty million, one hundred twenty thousand, forty".