22155904 has 32 divisors (see below), whose sum is σ = 44431200. Its totient is φ = 11004672.

The previous prime is 22155901. The next prime is 22155911. The reversal of 22155904 is 40955122.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (22155901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22429 + ... + 23395.

It is an arithmetic number, because the mean of its divisors is an integer number (1388475).

Almost surely, 2^22155904 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 22155904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22215600).

22155904 is an abundant number, since it is smaller than the sum of its proper divisors (22275296).

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

22155904 is an equidigital number, since it uses as much as digits as its factorization.

22155904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160 (or 1148 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 22155904 is about 4707.0058423588. The cubic root of 22155904 is about 280.8642683174.

The spelling of 22155904 in words is "twenty-two million, one hundred fifty-five thousand, nine hundred four".