7312840 has 16 divisors (see below), whose sum is σ = 16453980. Its totient is φ = 2925120.

The previous prime is 7312831. The next prime is 7312841. The reversal of 7312840 is 482137.

It can be written as a sum of positive squares in 2 ways, for example, as 7193124 + 119716 = 2682^2 + 346^2 .

It is not an unprimeable number, because it can be changed into a prime (7312841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91371 + ... + 91450.

Almost surely, 2^7312840 is an apocalyptic number.

It is an amenable number.

7312840 is an abundant number, since it is smaller than the sum of its proper divisors (9141140).

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

7312840 is a wasteful number, since it uses less digits than its factorization.

7312840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182832 (or 182828 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 7312840 is about 2704.2263218895. The cubic root of 7312840 is about 194.1014101185.

Adding to 7312840 its reverse (482137), we get a palindrome (7794977).

The spelling of 7312840 in words is "seven million, three hundred twelve thousand, eight hundred forty".