22188726 has 48 divisors (see below), whose sum is σ = 55255200. Its totient is φ = 6303744.

The previous prime is 22188671. The next prime is 22188737. The reversal of 22188726 is 62788122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28470 + ... + 29238.

It is an arithmetic number, because the mean of its divisors is an integer number (1151150).

Almost surely, 2^22188726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22188726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27627600).

22188726 is an abundant number, since it is smaller than the sum of its proper divisors (33066474).

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

22188726 is a wasteful number, since it uses less digits than its factorization.

22188726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013 (or 1010 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 22188726 is about 4710.4910572041. The cubic root of 22188726 is about 281.0028916932.

The spelling of 22188726 in words is "twenty-two million, one hundred eighty-eight thousand, seven hundred twenty-six".