22187223 has 16 divisors (see below), whose sum is σ = 32942560. Its totient is φ = 14758848.

The previous prime is 22187219. The next prime is 22187237. The reversal of 22187223 is 32278122.

It is a happy number.

It is not a de Polignac number, because 22187223 - 2² = 22187219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22187213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23211 + ... + 24147.

It is an arithmetic number, because the mean of its divisors is an integer number (2058910).

Almost surely, 2^22187223 is an apocalyptic number.

22187223 is a deficient number, since it is larger than the sum of its proper divisors (10755337).

22187223 is an equidigital number, since it uses as much as digits as its factorization.

22187223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823 (or 1817 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 22187223 is about 4710.3315169954. The cubic root of 22187223 is about 280.9965467760.

The spelling of 22187223 in words is "twenty-two million, one hundred eighty-seven thousand, two hundred twenty-three".