7218420 has 48 divisors (see below), whose sum is σ = 22051008. Its totient is φ = 1749760.

The previous prime is 7218403. The next prime is 7218433. The reversal of 7218420 is 248127.

7218420 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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, 4809 + ... + 6128.

It is an arithmetic number, because the mean of its divisors is an integer number (459396).

Almost surely, 2^7218420 is an apocalyptic number.

It is an amenable number.

7218420 is an abundant number, since it is smaller than the sum of its proper divisors (14832588).

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

7218420 is a wasteful number, since it uses less digits than its factorization.

7218420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10960 (or 10958 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 7218420 is about 2686.7117448658. The cubic root of 7218420 is about 193.2624062722.

The spelling of 7218420 in words is "seven million, two hundred eighteen thousand, four hundred twenty".