22139208 has 192 divisors, whose sum is σ = 76876800. Its totient is φ = 5598720.

The previous prime is 22139203. The next prime is 22139231. The reversal of 22139208 is 80293122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22139203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 203058 + ... + 203166.

It is an arithmetic number, because the mean of its divisors is an integer number (400400).

Almost surely, 2^22139208 is an apocalyptic number.

22139208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22139208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38438400).

22139208 is an abundant number, since it is smaller than the sum of its proper divisors (54737592).

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

22139208 is a wasteful number, since it uses less digits than its factorization.

22139208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 22139208 is about 4705.2319815286. The cubic root of 22139208 is about 280.7937003968.

The spelling of 22139208 in words is "twenty-two million, one hundred thirty-nine thousand, two hundred eight".