22217845 has 8 divisors (see below), whose sum is σ = 28712376. Its totient is φ = 16406976.

The previous prime is 22217791. The next prime is 22217849. The reversal of 22217845 is 54871222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5476 + 22212369 = 74^2 + 4713^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22217845 - 2⁷ = 22217717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22217849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170842 + ... + 170971.

It is an arithmetic number, because the mean of its divisors is an integer number (3589047).

Almost surely, 2^22217845 is an apocalyptic number.

It is an amenable number.

22217845 is a deficient number, since it is larger than the sum of its proper divisors (6494531).

22217845 is a wasteful number, since it uses less digits than its factorization.

22217845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341831.

The product of its digits is 8960, while the sum is 31.

The square root of 22217845 is about 4713.5809105180. The cubic root of 22217845 is about 281.1257610941.

The spelling of 22217845 in words is "twenty-two million, two hundred seventeen thousand, eight hundred forty-five".