7229820 has 144 divisors (see below), whose sum is σ = 23611392. Its totient is φ = 1647360.

The previous prime is 7229813. The next prime is 7229857. The reversal of 7229820 is 289227.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 47 ways as a sum of consecutive naturals, for example, 233205 + ... + 233235.

It is an arithmetic number, because the mean of its divisors is an integer number (163968).

Almost surely, 2^7229820 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 7229820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11805696).

7229820 is an abundant number, since it is smaller than the sum of its proper divisors (16381572).

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

7229820 is a wasteful number, since it uses less digits than its factorization.

7229820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 7229820 is about 2688.8324603813. The cubic root of 7229820 is about 193.3640920806.

It can be divided in two parts, 72 and 29820, that added together give a palindrome (29892).

The spelling of 7229820 in words is "seven million, two hundred twenty-nine thousand, eight hundred twenty".