7881222 has 32 divisors (see below), whose sum is σ = 16372224. Its totient is φ = 2527200.

The previous prime is 7881221. The next prime is 7881227. The reversal of 7881222 is 2221887.

It is a happy number.

It is a super-2 number, since 2×7881222² = 124227320426568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 7881222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28947 + ... + 29217.

It is an arithmetic number, because the mean of its divisors is an integer number (511632).

Almost surely, 2^7881222 is an apocalyptic number.

7881222 is an abundant number, since it is smaller than the sum of its proper divisors (8491002).

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

7881222 is a wasteful number, since it uses less digits than its factorization.

7881222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444.

The product of its digits is 3584, while the sum is 30.

The square root of 7881222 is about 2807.3514208235. The cubic root of 7881222 is about 199.0052438371.

The spelling of 7881222 in words is "seven million, eight hundred eighty-one thousand, two hundred twenty-two".