7222530 has 64 divisors (see below), whose sum is σ = 20026368. Its totient is φ = 1632960.

The previous prime is 7222517. The next prime is 7222549. The reversal of 7222530 is 352227.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7222497 and 7222506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34125 + ... + 34335.

It is an arithmetic number, because the mean of its divisors is an integer number (312912).

Almost surely, 2^7222530 is an apocalyptic number.

7222530 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7222530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10013184).

7222530 is an abundant number, since it is smaller than the sum of its proper divisors (12803838).

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

7222530 is a wasteful number, since it uses less digits than its factorization.

7222530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391.

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 7222530 is about 2687.4765115253. The cubic root of 7222530 is about 193.2990790152.

Adding to 7222530 its reverse (352227), we get a palindrome (7574757).

The spelling of 7222530 in words is "seven million, two hundred twenty-two thousand, five hundred thirty".