18536243 has 4 divisors (see below), whose sum is σ = 20221368. Its totient is φ = 16851120.

The previous prime is 18536201. The next prime is 18536261. The reversal of 18536243 is 34263581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34263581 = 11 ⋅3114871.

It is not a de Polignac number, because 18536243 - 2⁶ = 18536179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18536263) 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, 842546 + ... + 842567.

It is an arithmetic number, because the mean of its divisors is an integer number (5055342).

Almost surely, 2^18536243 is an apocalyptic number.

18536243 is a deficient number, since it is larger than the sum of its proper divisors (1685125).

18536243 is a wasteful number, since it uses less digits than its factorization.

18536243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685124.

The product of its digits is 17280, while the sum is 32.

The square root of 18536243 is about 4305.3737352290. The cubic root of 18536243 is about 264.6512226612.

The spelling of 18536243 in words is "eighteen million, five hundred thirty-six thousand, two hundred forty-three".