19641243 has 4 divisors (see below), whose sum is σ = 26188328. Its totient is φ = 13094160.

The previous prime is 19641233. The next prime is 19641247. The reversal of 19641243 is 34214691.

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

It is not a de Polignac number, because 19641243 - 2⁸ = 19640987 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 19641243.

It is not an unprimeable number, because it can be changed into a prime (19641247) 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, 3273538 + ... + 3273543.

It is an arithmetic number, because the mean of its divisors is an integer number (6547082).

Almost surely, 2^19641243 is an apocalyptic number.

19641243 is a deficient number, since it is larger than the sum of its proper divisors (6547085).

19641243 is an equidigital number, since it uses as much as digits as its factorization.

19641243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6547084.

The product of its digits is 5184, while the sum is 30.

The square root of 19641243 is about 4431.8441985250. The cubic root of 19641243 is about 269.8089320363.

The spelling of 19641243 in words is "nineteen million, six hundred forty-one thousand, two hundred forty-three".