19489243 has 2 divisors, whose sum is σ = 19489244. Its totient is φ = 19489242.

The previous prime is 19489237. The next prime is 19489291. The reversal of 19489243 is 34298491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19489243 - 2⁹ = 19488731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19489196 and 19489205.

It is not a weakly prime, because it can be changed into another prime (19489543) 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 as a sum of consecutive naturals, namely, 9744621 + 9744622.

It is an arithmetic number, because the mean of its divisors is an integer number (9744622).

Almost surely, 2^19489243 is an apocalyptic number.

19489243 is a deficient number, since it is larger than the sum of its proper divisors (1).

19489243 is an equidigital number, since it uses as much as digits as its factorization.

19489243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 19489243 is about 4414.6622747386. The cubic root of 19489243 is about 269.1111281519. Note that the first 4 decimals are identical.

The spelling of 19489243 in words is "nineteen million, four hundred eighty-nine thousand, two hundred forty-three".