18805043 has 4 divisors (see below), whose sum is σ = 19911240. Its totient is φ = 17698848.

The previous prime is 18805037. The next prime is 18805049. The reversal of 18805043 is 34050881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34050881 = 17 ⋅2002993.

It is an interprime number because it is at equal distance from previous prime (18805037) and next prime (18805049).

It is a cyclic number.

It is not a de Polignac number, because 18805043 - 2⁴ = 18805027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18804997 and 18805015.

It is not an unprimeable number, because it can be changed into a prime (18805049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553073 + ... + 553106.

It is an arithmetic number, because the mean of its divisors is an integer number (4977810).

Almost surely, 2^18805043 is an apocalyptic number.

18805043 is a deficient number, since it is larger than the sum of its proper divisors (1106197).

18805043 is a wasteful number, since it uses less digits than its factorization.

18805043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106196.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 18805043 is about 4336.4781793525. The cubic root of 18805043 is about 265.9243523933.

The spelling of 18805043 in words is "eighteen million, eight hundred five thousand, forty-three".