22191372 has 72 divisors (see below), whose sum is σ = 64786176. Its totient is φ = 6273504.

The previous prime is 22191361. The next prime is 22191391. The reversal of 22191372 is 27319122.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 26553 + ... + 27375.

It is an arithmetic number, because the mean of its divisors is an integer number (899808).

Almost surely, 2^22191372 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 22191372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32393088).

22191372 is an abundant number, since it is smaller than the sum of its proper divisors (42594804).

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

22191372 is a wasteful number, since it uses less digits than its factorization.

22191372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947 (or 942 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 22191372 is about 4710.7719112689. The cubic root of 22191372 is about 281.0140610906.

The spelling of 22191372 in words is "twenty-two million, one hundred ninety-one thousand, three hundred seventy-two".