19894999349 has 4 divisors (see below), whose sum is σ = 19958970720. Its totient is φ = 19831027980.

The previous prime is 19894999339. The next prime is 19894999357. The reversal of 19894999349 is 94399949891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94399949891 = 13 ⋅7261534607.

It is a cyclic number.

It is not a de Polignac number, because 19894999349 - 2¹⁶ = 19894933813 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 (19894999339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31985219 + ... + 31985840.

It is an arithmetic number, because the mean of its divisors is an integer number (4989742680).

Almost surely, 2^19894999349 is an apocalyptic number.

It is an amenable number.

19894999349 is a deficient number, since it is larger than the sum of its proper divisors (63971371).

19894999349 is an equidigital number, since it uses as much as digits as its factorization.

19894999349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63971370.

The product of its digits is 204073344, while the sum is 74.

The spelling of 19894999349 in words is "nineteen billion, eight hundred ninety-four million, nine hundred ninety-nine thousand, three hundred forty-nine".