18729343 has 2 divisors, whose sum is σ = 18729344. Its totient is φ = 18729342.

The previous prime is 18729341. The next prime is 18729349. The reversal of 18729343 is 34392781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18729343 - 2¹ = 18729341 is a prime.

Together with 18729341, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18729341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9364671 + 9364672.

It is an arithmetic number, because the mean of its divisors is an integer number (9364672).

Almost surely, 2^18729343 is an apocalyptic number.

18729343 is a deficient number, since it is larger than the sum of its proper divisors (1).

18729343 is an equidigital number, since it uses as much as digits as its factorization.

18729343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 18729343 is about 4327.7410966924. The cubic root of 18729343 is about 265.5670449432.

The spelling of 18729343 in words is "eighteen million, seven hundred twenty-nine thousand, three hundred forty-three".