19138890843 has 10 divisors (see below), whose sum is σ = 28590195084. Its totient is φ = 12759260508.

The previous prime is 19138890833. The next prime is 19138890889. The reversal of 19138890843 is 34809883191.

It is not a de Polignac number, because 19138890843 - 2¹⁸ = 19138628699 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19138890843.

It is not an unprimeable number, because it can be changed into a prime (19138890833) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 118141221 + ... + 118141382.

Almost surely, 2^19138890843 is an apocalyptic number.

19138890843 is a deficient number, since it is larger than the sum of its proper divisors (9451304241).

19138890843 is an equidigital number, since it uses as much as digits as its factorization.

19138890843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236282615 (or 236282606 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 19138890843 in words is "nineteen billion, one hundred thirty-eight million, eight hundred ninety thousand, eight hundred forty-three".