22199904 has 72 divisors (see below), whose sum is σ = 66470040. Its totient is φ = 7008768.

The previous prime is 22199887. The next prime is 22199929. The reversal of 22199904 is 40999122.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3444 + ... + 7500.

It is an arithmetic number, because the mean of its divisors is an integer number (923195).

Almost surely, 2^22199904 is an apocalyptic number.

22199904 is a gapful number since it is divisible by the number (24) 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 22199904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33235020).

22199904 is an abundant number, since it is smaller than the sum of its proper divisors (44270136).

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

22199904 is a wasteful number, since it uses less digits than its factorization.

22199904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4092 (or 4081 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 22199904 is about 4711.6774083122. The cubic root of 22199904 is about 281.0500706527.

The spelling of 22199904 in words is "twenty-two million, one hundred ninety-nine thousand, nine hundred four".