12222738 has 80 divisors (see below), whose sum is σ = 31537440. Its totient is φ = 3508920.

The previous prime is 12222733. The next prime is 12222751. The reversal of 12222738 is 83722221.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (12222731) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 643293 + ... + 643311.

It is an arithmetic number, because the mean of its divisors is an integer number (394218).

Almost surely, 2^12222738 is an apocalyptic number.

12222738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12222738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15768720).

12222738 is an abundant number, since it is smaller than the sum of its proper divisors (19314702).

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

12222738 is an equidigital number, since it uses as much as digits as its factorization.

12222738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 35 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 12222738 is about 3496.1032593446. The cubic root of 12222738 is about 230.3506811755.

Adding to 12222738 its reverse (83722221), we get a palindrome (95944959).

It can be divided in two parts, 122227 and 38, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 12222738 in words is "twelve million, two hundred twenty-two thousand, seven hundred thirty-eight".