18356941 has 2 divisors, whose sum is σ = 18356942. Its totient is φ = 18356940.

The previous prime is 18356939. The next prime is 18356951. The reversal of 18356941 is 14965381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9326916 + 9030025 = 3054^2 + 3005^2 .

It is a cyclic number.

It is not a de Polignac number, because 18356941 - 2¹ = 18356939 is a prime.

Together with 18356939, it forms a pair of twin primes.

It is the 4285-th Hogben number.

It is a self number, because there is not a number n which added to its sum of digits gives 18356941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18356951) by changing a digit.

It is a nontrivial repunit in base 4284.

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, 9178470 + 9178471.

It is an arithmetic number, because the mean of its divisors is an integer number (9178471).

Almost surely, 2^18356941 is an apocalyptic number.

It is an amenable number.

18356941 is a deficient number, since it is larger than the sum of its proper divisors (1).

18356941 is an equidigital number, since it uses as much as digits as its factorization.

18356941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 18356941 is about 4284.5000875248. The cubic root of 18356941 is about 263.7951282064.

The spelling of 18356941 in words is "eighteen million, three hundred fifty-six thousand, nine hundred forty-one".