22440138729 has 4 divisors (see below), whose sum is σ = 29920184976. Its totient is φ = 14960092484.

The previous prime is 22440138683. The next prime is 22440138751. The reversal of 22440138729 is 92783104422.

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 a cyclic number.

It is not a de Polignac number, because 22440138729 - 2¹⁶ = 22440073193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22440138779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3740023119 + ... + 3740023124.

It is an arithmetic number, because the mean of its divisors is an integer number (7480046244).

Almost surely, 2^22440138729 is an apocalyptic number.

It is an amenable number.

22440138729 is a deficient number, since it is larger than the sum of its proper divisors (7480046247).

22440138729 is an equidigital number, since it uses as much as digits as its factorization.

22440138729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7480046246.

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 22440138729 in words is "twenty-two billion, four hundred forty million, one hundred thirty-eight thousand, seven hundred twenty-nine".