19909343 has 4 divisors (see below), whose sum is σ = 20161440. Its totient is φ = 19657248.

The previous prime is 19909303. The next prime is 19909361. The reversal of 19909343 is 34390991.

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 19909343 - 2¹⁰ = 19908319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19909297 and 19909306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19909303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125930 + ... + 126087.

It is an arithmetic number, because the mean of its divisors is an integer number (5040360).

Almost surely, 2^19909343 is an apocalyptic number.

19909343 is a deficient number, since it is larger than the sum of its proper divisors (252097).

19909343 is an equidigital number, since it uses as much as digits as its factorization.

19909343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252096.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 19909343 is about 4461.9886821909. The cubic root of 19909343 is about 271.0310054711.

The spelling of 19909343 in words is "nineteen million, nine hundred nine thousand, three hundred forty-three".