19800193 has 4 divisors (see below), whose sum is σ = 22628800. Its totient is φ = 16971588.

The previous prime is 19800191. The next prime is 19800197. The reversal of 19800193 is 39100891.

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.

It is a cyclic number.

It is not a de Polignac number, because 19800193 - 2¹ = 19800191 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19800191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1414293 + ... + 1414306.

It is an arithmetic number, because the mean of its divisors is an integer number (5657200).

Almost surely, 2^19800193 is an apocalyptic number.

It is an amenable number.

19800193 is a deficient number, since it is larger than the sum of its proper divisors (2828607).

19800193 is an equidigital number, since it uses as much as digits as its factorization.

19800193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828606.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 19800193 is about 4449.7407789668. The cubic root of 19800193 is about 270.5348019042.

The spelling of 19800193 in words is "nineteen million, eight hundred thousand, one hundred ninety-three".