19309635444 has 72 divisors (see below), whose sum is σ = 50080947840. Its totient is φ = 5785619840.

The previous prime is 19309635403. The next prime is 19309635469. The reversal of 19309635444 is 44453690391.

It is a junction number, because it is equal to n+sod(n) for n = 19309635393 and 19309635402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54517 + ... + 203939.

It is an arithmetic number, because the mean of its divisors is an integer number (695568720).

Almost surely, 2^19309635444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19309635444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25040473920).

19309635444 is an abundant number, since it is smaller than the sum of its proper divisors (30771312396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19309635444 is a wasteful number, since it uses less digits than its factorization.

19309635444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149541 (or 149528 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 48.

The spelling of 19309635444 in words is "nineteen billion, three hundred nine million, six hundred thirty-five thousand, four hundred forty-four".