19749051839 has 8 divisors (see below), whose sum is σ = 22678337280. Its totient is φ = 17008752600.

The previous prime is 19749051787. The next prime is 19749051841. The reversal of 19749051839 is 93815094791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19749051839 - 2⁸ = 19749051583 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 (19749251839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47246327 + ... + 47246744.

It is an arithmetic number, because the mean of its divisors is an integer number (2834792160).

Almost surely, 2^19749051839 is an apocalyptic number.

19749051839 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19749051839 is a deficient number, since it is larger than the sum of its proper divisors (2929285441).

19749051839 is a wasteful number, since it uses less digits than its factorization.

19749051839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94493101.

The product of its (nonzero) digits is 2449440, while the sum is 56.

The spelling of 19749051839 in words is "nineteen billion, seven hundred forty-nine million, fifty-one thousand, eight hundred thirty-nine".