19489903764 has 12 divisors (see below), whose sum is σ = 45476442144. Its totient is φ = 6496634584.

The previous prime is 19489903757. The next prime is 19489903781. The reversal of 19489903764 is 46730998491.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 19489903698 and 19489903707.

It is a congruent number.

It is an unprimeable number.

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, 812079312 + ... + 812079335.

It is an arithmetic number, because the mean of its divisors is an integer number (3789703512).

Almost surely, 2^19489903764 is an apocalyptic number.

It is an amenable number.

19489903764 is an abundant number, since it is smaller than the sum of its proper divisors (25986538380).

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

19489903764 is a wasteful number, since it uses less digits than its factorization.

19489903764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624158654 (or 1624158652 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 60.

The spelling of 19489903764 in words is "nineteen billion, four hundred eighty-nine million, nine hundred three thousand, seven hundred sixty-four".