18878243 has 4 divisors (see below), whose sum is σ = 18901080. Its totient is φ = 18855408.

The previous prime is 18878227. The next prime is 18878257. The reversal of 18878243 is 34287881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18878243 - 2⁴ = 18878227 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 18878243.

It is not an unprimeable number, because it can be changed into a prime (18878203) 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, 10130 + ... + 11847.

It is an arithmetic number, because the mean of its divisors is an integer number (4725270).

Almost surely, 2^18878243 is an apocalyptic number.

18878243 is a deficient number, since it is larger than the sum of its proper divisors (22837).

18878243 is an equidigital number, since it uses as much as digits as its factorization.

18878243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22836.

The product of its digits is 86016, while the sum is 41.

The square root of 18878243 is about 4344.9100105756. The cubic root of 18878243 is about 266.2689489625.

The spelling of 18878243 in words is "eighteen million, eight hundred seventy-eight thousand, two hundred forty-three".