1320540240 has 40 divisors (see below), whose sum is σ = 4093675488. Its totient is φ = 352144000.

The previous prime is 1320540197. The next prime is 1320540241. The reversal of 1320540240 is 420450231.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320540241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2750886 + ... + 2751365.

Almost surely, 2^1320540240 is an apocalyptic number.

1320540240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320540240 is an abundant number, since it is smaller than the sum of its proper divisors (2773135248).

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

1320540240 is a wasteful number, since it uses less digits than its factorization.

1320540240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5502267 (or 5502261 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 1320540240 is about 36339.2382969154. The cubic root of 1320540240 is about 1097.1109421907.

Adding to 1320540240 its reverse (420450231), we get a palindrome (1740990471).

Subtracting from 1320540240 its reverse (420450231), we obtain a palindrome (900090009).

The spelling of 1320540240 in words is "one billion, three hundred twenty million, five hundred forty thousand, two hundred forty".