19936243 has 4 divisors (see below), whose sum is σ = 20019208. Its totient is φ = 19853280.

The previous prime is 19936211. The next prime is 19936247. The reversal of 19936243 is 34263991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19936243 - 2⁵ = 19936211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19936247) 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 3 ways as a sum of consecutive naturals, for example, 41121 + ... + 41602.

It is an arithmetic number, because the mean of its divisors is an integer number (5004802).

Almost surely, 2^19936243 is an apocalyptic number.

19936243 is a deficient number, since it is larger than the sum of its proper divisors (82965).

19936243 is an equidigital number, since it uses as much as digits as its factorization.

19936243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82964.

The product of its digits is 34992, while the sum is 37.

The square root of 19936243 is about 4465.0020156770. The cubic root of 19936243 is about 271.1530160759.

The spelling of 19936243 in words is "nineteen million, nine hundred thirty-six thousand, two hundred forty-three".