22007891 has 4 divisors (see below), whose sum is σ = 22476192. Its totient is φ = 21539592.

The previous prime is 22007827. The next prime is 22007893. The reversal of 22007891 is 19870022.

It is a happy number.

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 22007891 - 2⁶ = 22007827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22007893) 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 3 ways as a sum of consecutive naturals, for example, 234080 + ... + 234173.

It is an arithmetic number, because the mean of its divisors is an integer number (5619048).

Almost surely, 2^22007891 is an apocalyptic number.

22007891 is a deficient number, since it is larger than the sum of its proper divisors (468301).

22007891 is an equidigital number, since it uses as much as digits as its factorization.

22007891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468300.

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

The square root of 22007891 is about 4691.2568678340. The cubic root of 22007891 is about 280.2374304130.

The spelling of 22007891 in words is "twenty-two million, seven thousand, eight hundred ninety-one".