18355943 has 2 divisors, whose sum is σ = 18355944. Its totient is φ = 18355942.

The previous prime is 18355933. The next prime is 18355949. The reversal of 18355943 is 34955381.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (34955381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18355943 - 2⁶ = 18355879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18355897 and 18355906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18355949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9177971 + 9177972.

It is an arithmetic number, because the mean of its divisors is an integer number (9177972).

Almost surely, 2^18355943 is an apocalyptic number.

18355943 is a deficient number, since it is larger than the sum of its proper divisors (1).

18355943 is an equidigital number, since it uses as much as digits as its factorization.

18355943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The square root of 18355943 is about 4284.3836196120. The cubic root of 18355943 is about 263.7903475931.

The spelling of 18355943 in words is "eighteen million, three hundred fifty-five thousand, nine hundred forty-three".