19890346943 has 2 divisors, whose sum is σ = 19890346944. Its totient is φ = 19890346942.

The previous prime is 19890346913. The next prime is 19890346967. The reversal of 19890346943 is 34964309891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19890346943 - 2¹² = 19890342847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19890346913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9945173471 + 9945173472.

It is an arithmetic number, because the mean of its divisors is an integer number (9945173472).

Almost surely, 2^19890346943 is an apocalyptic number.

19890346943 is a deficient number, since it is larger than the sum of its proper divisors (1).

19890346943 is an equidigital number, since it uses as much as digits as its factorization.

19890346943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5038848, while the sum is 56.

The spelling of 19890346943 in words is "nineteen billion, eight hundred ninety million, three hundred forty-six thousand, nine hundred forty-three".