22290 has 16 divisors (see below), whose sum is σ = 53568. Its totient is φ = 5936.
The previous prime is 22283. The next prime is 22291. The reversal of 22290 is 9222.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is not an unprimeable number, because it can be changed into a prime (22291) 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 7 ways as a sum of consecutive naturals, for example, 342 + ... + 401.
It is an arithmetic number, because the mean of its divisors is an integer number (3348).
222290 is an apocalyptic number.
22290 is an abundant number, since it is smaller than the sum of its proper divisors (31278).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26784).
22290 is a wasteful number, since it uses less digits than its factorization.
22290 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 753.
The product of its (nonzero) digits is 72, while the sum is 15.
The square root of 22290 is about 149.2983589997. The cubic root of 22290 is about 28.1429761624.
The spelling of 22290 in words is "twenty-two thousand, two hundred ninety".
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