19304240391 has 6 divisors (see below), whose sum is σ = 27883902800. Its totient is φ = 12869493588.

The previous prime is 19304240381. The next prime is 19304240419.

19304240391 is a `hidden beast` number, since 193 + 0 + 42 + 40 + 391 = 666.

19304240391 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 19304240391 - 2⁵ = 19304240359 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 (19304240341) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1072457791 + ... + 1072457808.

Almost surely, 2^19304240391 is an apocalyptic number.

19304240391 is a deficient number, since it is larger than the sum of its proper divisors (8579662409).

19304240391 is a wasteful number, since it uses less digits than its factorization.

19304240391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144915605 (or 2144915602 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The spelling of 19304240391 in words is "nineteen billion, three hundred four million, two hundred forty thousand, three hundred ninety-one".