19391441896 has 8 divisors (see below), whose sum is σ = 36358953570. Its totient is φ = 9695720944.

The previous prime is 19391441879. The next prime is 19391441899. The reversal of 19391441896 is 69814419391.

It can be written as a sum of positive squares in only one way, i.e., 19063324900 + 328116996 = 138070^2 + 18114^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (19391441899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1211965111 + ... + 1211965126.

Almost surely, 2^19391441896 is an apocalyptic number.

It is an amenable number.

19391441896 is a deficient number, since it is larger than the sum of its proper divisors (16967511674).

19391441896 is a wasteful number, since it uses less digits than its factorization.

19391441896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2423930243 (or 2423930239 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 55.

The spelling of 19391441896 in words is "nineteen billion, three hundred ninety-one million, four hundred forty-one thousand, eight hundred ninety-six".