22191872 has 36 divisors (see below), whose sum is σ = 46235280. Its totient is φ = 10610688.

The previous prime is 22191833. The next prime is 22191881. The reversal of 22191872 is 27819122.

It is a happy number.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4004 + ... + 7772.

Almost surely, 2^22191872 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 22191872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23117640).

22191872 is an abundant number, since it is smaller than the sum of its proper divisors (24043408).

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

22191872 is an equidigital number, since it uses as much as digits as its factorization.

22191872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808 (or 3794 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 22191872 is about 4710.8249808287. The cubic root of 22191872 is about 281.0161716102.

The spelling of 22191872 in words is "twenty-two million, one hundred ninety-one thousand, eight hundred seventy-two".