18356843 has 2 divisors, whose sum is σ = 18356844. Its totient is φ = 18356842.

The previous prime is 18356827. The next prime is 18356881. The reversal of 18356843 is 34865381.

It is an a-pointer prime, because the next prime (18356881) can be obtained adding 18356843 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18356843 - 2⁴ = 18356827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18356797 and 18356806.

It is not a weakly prime, because it can be changed into another prime (18356803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9178421 + 9178422.

It is an arithmetic number, because the mean of its divisors is an integer number (9178422).

Almost surely, 2^18356843 is an apocalyptic number.

18356843 is a deficient number, since it is larger than the sum of its proper divisors (1).

18356843 is an equidigital number, since it uses as much as digits as its factorization.

18356843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 38.

The square root of 18356843 is about 4284.4886509361. The cubic root of 18356843 is about 263.7946587751.

The spelling of 18356843 in words is "eighteen million, three hundred fifty-six thousand, eight hundred forty-three".