18855943 has 4 divisors (see below), whose sum is σ = 18923328. Its totient is φ = 18788560.

The previous prime is 18855937. The next prime is 18855953. The reversal of 18855943 is 34955881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34955881 = 1409 ⋅24809.

It is a cyclic number.

It is not a de Polignac number, because 18855943 - 2⁵ = 18855911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18855943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18855953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33271 + ... + 33832.

It is an arithmetic number, because the mean of its divisors is an integer number (4730832).

Almost surely, 2^18855943 is an apocalyptic number.

18855943 is a deficient number, since it is larger than the sum of its proper divisors (67385).

18855943 is an equidigital number, since it uses as much as digits as its factorization.

18855943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67384.

The product of its digits is 172800, while the sum is 43.

The square root of 18855943 is about 4342.3430311296. The cubic root of 18855943 is about 266.1640638996.

The spelling of 18855943 in words is "eighteen million, eight hundred fifty-five thousand, nine hundred forty-three".