19808943 has 32 divisors (see below), whose sum is σ = 34076160. Its totient is φ = 9932160.

The previous prime is 19808923. The next prime is 19808947. The reversal of 19808943 is 34980891.

It is not a de Polignac number, because 19808943 - 2⁶ = 19808879 is a prime.

19808943 is a modest number, since divided by 8943 gives 198 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 19808895 and 19808904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19808947) 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 31 ways as a sum of consecutive naturals, for example, 5221 + ... + 8177.

It is an arithmetic number, because the mean of its divisors is an integer number (1064880).

Almost surely, 2^19808943 is an apocalyptic number.

19808943 is a deficient number, since it is larger than the sum of its proper divisors (14267217).

19808943 is a wasteful number, since it uses less digits than its factorization.

19808943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 19808943 is about 4450.7238737086. The cubic root of 19808943 is about 270.5746471539.

The spelling of 19808943 in words is "nineteen million, eight hundred eight thousand, nine hundred forty-three".