22288391 has 4 divisors (see below), whose sum is σ = 22602384. Its totient is φ = 21974400.

The previous prime is 22288381. The next prime is 22288397. The reversal of 22288391 is 19388222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22288391 - 2¹⁸ = 22026247 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 (22288397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156890 + ... + 157031.

It is an arithmetic number, because the mean of its divisors is an integer number (5650596).

Almost surely, 2^22288391 is an apocalyptic number.

22288391 is a deficient number, since it is larger than the sum of its proper divisors (313993).

22288391 is an equidigital number, since it uses as much as digits as its factorization.

22288391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313992.

The product of its digits is 13824, while the sum is 35.

The square root of 22288391 is about 4721.0582500113. The cubic root of 22288391 is about 281.4229898070.

The spelling of 22288391 in words is "twenty-two million, two hundred eighty-eight thousand, three hundred ninety-one".