19450440223 has 4 divisors (see below), whose sum is σ = 19451691000. Its totient is φ = 19449189448.

The previous prime is 19450440211. The next prime is 19450440227. The reversal of 19450440223 is 32204405491.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19450440223 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 (19450440227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601765 + ... + 633262.

It is an arithmetic number, because the mean of its divisors is an integer number (4862922750).

Almost surely, 2^19450440223 is an apocalyptic number.

19450440223 is a deficient number, since it is larger than the sum of its proper divisors (1250777).

19450440223 is a wasteful number, since it uses less digits than its factorization.

19450440223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250776.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 19450440223 in words is "nineteen billion, four hundred fifty million, four hundred forty thousand, two hundred twenty-three".