22187009 has 8 divisors (see below), whose sum is σ = 24299520. Its totient is φ = 20132496.

The previous prime is 22186999. The next prime is 22187021. The reversal of 22187009 is 90078122.

It is a happy number.

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 22187009 - 2⁴ = 22186993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22187029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13697 + ... + 15230.

It is an arithmetic number, because the mean of its divisors is an integer number (3037440).

Almost surely, 2^22187009 is an apocalyptic number.

It is an amenable number.

22187009 is a deficient number, since it is larger than the sum of its proper divisors (2112511).

22187009 is a wasteful number, since it uses less digits than its factorization.

22187009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28999.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 22187009 is about 4710.3088009174. The cubic root of 22187009 is about 280.9956433514.

The spelling of 22187009 in words is "twenty-two million, one hundred eighty-seven thousand, nine".