7421440 has 80 divisors (see below), whose sum is σ = 19248768. Its totient is φ = 2727936.

The previous prime is 7421437. The next prime is 7421471. The reversal of 7421440 is 441247.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33169 + ... + 33391.

Almost surely, 2^7421440 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 7421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9624384).

7421440 is an abundant number, since it is smaller than the sum of its proper divisors (11827328).

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

7421440 is a wasteful number, since it uses less digits than its factorization.

7421440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 7421440 is about 2724.2320018677. The cubic root of 7421440 is about 195.0575328814.

Adding to 7421440 its reverse (441247), we get a palindrome (7862687).

The spelling of 7421440 in words is "seven million, four hundred twenty-one thousand, four hundred forty".