19918343 has 2 divisors, whose sum is σ = 19918344. Its totient is φ = 19918342.

The previous prime is 19918319. The next prime is 19918357. The reversal of 19918343 is 34381991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19918343 - 2⁶ = 19918279 is a prime.

It is a super-3 number, since 3×19918343³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19918297 and 19918306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19918303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9959171 + 9959172.

It is an arithmetic number, because the mean of its divisors is an integer number (9959172).

Almost surely, 2^19918343 is an apocalyptic number.

19918343 is a deficient number, since it is larger than the sum of its proper divisors (1).

19918343 is an equidigital number, since it uses as much as digits as its factorization.

19918343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 19918343 is about 4462.9970871602. The cubic root of 19918343 is about 271.0718390901.

The spelling of 19918343 in words is "nineteen million, nine hundred eighteen thousand, three hundred forty-three".