7421724 has 72 divisors (see below), whose sum is σ = 20271888. Its totient is φ = 2280960.

The previous prime is 7421717. The next prime is 7421759. The reversal of 7421724 is 4271247.

It is a happy number.

It is a zygodrome in base 5.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 40914 + ... + 41094.

It is an arithmetic number, because the mean of its divisors is an integer number (281554).

Almost surely, 2^7421724 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 7421724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10135944).

7421724 is an abundant number, since it is smaller than the sum of its proper divisors (12850164).

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

7421724 is a wasteful number, since it uses less digits than its factorization.

7421724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 270 counting only the distinct ones).

The product of its digits is 3136, while the sum is 27.

The square root of 7421724 is about 2724.2841261513. The cubic root of 7421724 is about 195.0600209714.

The spelling of 7421724 in words is "seven million, four hundred twenty-one thousand, seven hundred twenty-four".