7540440 has 64 divisors (see below), whose sum is σ = 23362560. Its totient is φ = 1944960.

The previous prime is 7540439. The next prime is 7540441. The reversal of 7540440 is 440457.

It is an interprime number because it is at equal distance from previous prime (7540439) and next prime (7540441).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 7540440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7540441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2707 + ... + 4733.

It is an arithmetic number, because the mean of its divisors is an integer number (365040).

Almost surely, 2^7540440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7540440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11681280).

7540440 is an abundant number, since it is smaller than the sum of its proper divisors (15822120).

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

7540440 is a wasteful number, since it uses less digits than its factorization.

7540440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2072 (or 2068 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 7540440 is about 2745.9861616549. The cubic root of 7540440 is about 196.0945677204.

Adding to 7540440 its reverse (440457), we get a palindrome (7980897).

The spelling of 7540440 in words is "seven million, five hundred forty thousand, four hundred forty".