19799843 has 16 divisors (see below), whose sum is σ = 24407040. Its totient is φ = 15681600.

The previous prime is 19799833. The next prime is 19799851. The reversal of 19799843 is 34899791.

It is a cyclic number.

It is not a de Polignac number, because 19799843 - 2⁴ = 19799827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19799791 and 19799800.

It is not an unprimeable number, because it can be changed into a prime (19799833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3638 + ... + 7268.

It is an arithmetic number, because the mean of its divisors is an integer number (1525440).

Almost surely, 2^19799843 is an apocalyptic number.

19799843 is a deficient number, since it is larger than the sum of its proper divisors (4607197).

19799843 is a wasteful number, since it uses less digits than its factorization.

19799843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3698.

The product of its digits is 489888, while the sum is 50.

The square root of 19799843 is about 4449.7014506594. The cubic root of 19799843 is about 270.5332078501.

The spelling of 19799843 in words is "nineteen million, seven hundred ninety-nine thousand, eight hundred forty-three".