22140309 has 4 divisors (see below), whose sum is σ = 29520416. Its totient is φ = 14760204.

The previous prime is 22140299. The next prime is 22140323. The reversal of 22140309 is 90304122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22140309 - 2⁵ = 22140277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22140509) 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, 3690049 + ... + 3690054.

It is an arithmetic number, because the mean of its divisors is an integer number (7380104).

Almost surely, 2^22140309 is an apocalyptic number.

It is an amenable number.

22140309 is a deficient number, since it is larger than the sum of its proper divisors (7380107).

22140309 is an equidigital number, since it uses as much as digits as its factorization.

22140309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7380106.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 22140309 is about 4705.3489774936. The cubic root of 22140309 is about 280.7983550159.

The spelling of 22140309 in words is "twenty-two million, one hundred forty thousand, three hundred nine".