7257222 has 64 divisors (see below), whose sum is σ = 18754560. Its totient is φ = 2037312.

The previous prime is 7257179. The next prime is 7257227. The reversal of 7257222 is 2227527.

It is a happy number.

7257222 is a `hidden beast` number, since 72 + 572 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7257227) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 27463 + ... + 27725.

It is an arithmetic number, because the mean of its divisors is an integer number (293040).

Almost surely, 2^7257222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7257222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9377280).

7257222 is an abundant number, since it is smaller than the sum of its proper divisors (11497338).

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

7257222 is a wasteful number, since it uses less digits than its factorization.

7257222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 348 counting only the distinct ones).

The product of its digits is 3920, while the sum is 27.

The square root of 7257222 is about 2693.9231614877. The cubic root of 7257222 is about 193.6080761549.

The spelling of 7257222 in words is "seven million, two hundred fifty-seven thousand, two hundred twenty-two".