7481440 has 96 divisors (see below), whose sum is σ = 19595520. Its totient is φ = 2686464.

The previous prime is 7481407. The next prime is 7481491. The reversal of 7481440 is 441847.

It is a junction number, because it is equal to n+sod(n) for n = 7481399 and 7481408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69867 + ... + 69973.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

Almost surely, 2^7481440 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 7481440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9797760).

7481440 is an abundant number, since it is smaller than the sum of its proper divisors (12114080).

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

7481440 is a wasteful number, since it uses less digits than its factorization.

7481440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 7481440 is about 2735.2221116392. Note that the first 3 decimals coincide. The cubic root of 7481440 is about 195.5817821421.

It can be divided in two parts, 7481 and 440, that added together give a square (7921 = 89²).

The spelling of 7481440 in words is "seven million, four hundred eighty-one thousand, four hundred forty".