22857209 has 16 divisors (see below), whose sum is σ = 24953280. Its totient is φ = 20865600.

The previous prime is 22857203. The next prime is 22857221. The reversal of 22857209 is 90275822.

It is a cyclic number.

It is not a de Polignac number, because 22857209 - 2¹⁶ = 22791673 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22857203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82379 + ... + 82655.

It is an arithmetic number, because the mean of its divisors is an integer number (1559580).

Almost surely, 2^22857209 is an apocalyptic number.

It is an amenable number.

22857209 is a deficient number, since it is larger than the sum of its proper divisors (2096071).

22857209 is a wasteful number, since it uses less digits than its factorization.

22857209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 22857209 is about 4780.9213547181. The cubic root of 22857209 is about 283.7969561394.

The spelling of 22857209 in words is "twenty-two million, eight hundred fifty-seven thousand, two hundred nine".