9218772 has 60 divisors (see below), whose sum is σ = 24783220. Its totient is φ = 2985984.

The previous prime is 9218771. The next prime is 9218773. The reversal of 9218772 is 2778129.

It is an interprime number because it is at equal distance from previous prime (9218771) and next prime (9218773).

It can be written as a sum of positive squares in 2 ways, for example, as 6170256 + 3048516 = 2484^2 + 1746^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a d-powerful number, because it can be written as 9⁴ + 2 + 1 + 8 + 7² + 7⁷ + 2²³ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9218771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11604 + ... + 12372.

Almost surely, 2^9218772 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 9218772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12391610).

9218772 is an abundant number, since it is smaller than the sum of its proper divisors (15564448).

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

9218772 is a wasteful number, since it uses less digits than its factorization.

9218772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 811 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 9218772 is about 3036.2430732733. The cubic root of 9218772 is about 209.6803299595.

The spelling of 9218772 in words is "nine million, two hundred eighteen thousand, seven hundred seventy-two".