7440640 has 36 divisors (see below), whose sum is σ = 17825724. Its totient is φ = 2975744.

The previous prime is 7440637. The next prime is 7440649. The reversal of 7440640 is 460447.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3936256 + 3504384 = 1984^2 + 1872^2 .

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (7440649) 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 3 ways as a sum of consecutive naturals, for example, 1627 + ... + 4186.

It is an arithmetic number, because the mean of its divisors is an integer number (495159).

Almost surely, 2^7440640 is an apocalyptic number.

It is an amenable number.

7440640 is an abundant number, since it is smaller than the sum of its proper divisors (10385084).

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

7440640 is an equidigital number, since it uses as much as digits as its factorization.

7440640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5834 (or 5820 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 7440640 is about 2727.7536545663. The cubic root of 7440640 is about 195.2255990793.

The spelling of 7440640 in words is "seven million, four hundred forty thousand, six hundred forty".