19958243 has 6 divisors (see below), whose sum is σ = 20129052. Its totient is φ = 19788860.

The previous prime is 19958231. The next prime is 19958249. The reversal of 19958243 is 34285991.

It is not a de Polignac number, because 19958243 - 2¹⁰ = 19957219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19958243.

It is not an unprimeable number, because it can be changed into a prime (19958249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16580 + ... + 17742.

It is an arithmetic number, because the mean of its divisors is an integer number (3354842).

Almost surely, 2^19958243 is an apocalyptic number.

19958243 is a deficient number, since it is larger than the sum of its proper divisors (170809).

19958243 is an equidigital number, since it uses as much as digits as its factorization.

19958243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425 (or 1294 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 19958243 is about 4467.4649411047. The cubic root of 19958243 is about 271.2527201409.

The spelling of 19958243 in words is "nineteen million, nine hundred fifty-eight thousand, two hundred forty-three".