9891222 has 16 divisors (see below), whose sum is σ = 21580992. Its totient is φ = 2997320.

The previous prime is 9891221. The next prime is 9891239. The reversal of 9891222 is 2221989.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9891221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74868 + ... + 74999.

It is an arithmetic number, because the mean of its divisors is an integer number (1348812).

Almost surely, 2^9891222 is an apocalyptic number.

9891222 is an abundant number, since it is smaller than the sum of its proper divisors (11689770).

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

9891222 is a wasteful number, since it uses less digits than its factorization.

9891222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149883.

The product of its digits is 5184, while the sum is 33.

The square root of 9891222 is about 3145.0313193989. The cubic root of 9891222 is about 214.6594355849.

It can be divided in two parts, 989 and 1222, that added together give a triangular number (2211 = T₆₆).

The spelling of 9891222 in words is "nine million, eight hundred ninety-one thousand, two hundred twenty-two".