19401982368 has 24 divisors (see below), whose sum is σ = 50930203968. Its totient is φ = 6467327424.

The previous prime is 19401982331. The next prime is 19401982387. The reversal of 19401982368 is 86328910491.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 19401982368.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101051896 + ... + 101052087.

It is an arithmetic number, because the mean of its divisors is an integer number (2122091832).

Almost surely, 2^19401982368 is an apocalyptic number.

It is an amenable number.

19401982368 is an abundant number, since it is smaller than the sum of its proper divisors (31528221600).

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

19401982368 is a wasteful number, since it uses less digits than its factorization.

19401982368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202103996 (or 202103988 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The spelling of 19401982368 in words is "nineteen billion, four hundred one million, nine hundred eighty-two thousand, three hundred sixty-eight".