18878 has 4 divisors (see below), whose sum is σ = 28320. Its totient is φ = 9438.

The previous prime is 18869. The next prime is 18899. The reversal of 18878 is 87881.

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

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

18878 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4718 + ... + 4721.

It is an arithmetic number, because the mean of its divisors is an integer number (7080).

2¹⁸⁸⁷⁸ is an apocalyptic number.

18878 is a deficient number, since it is larger than the sum of its proper divisors (9442).

18878 is an equidigital number, since it uses as much as digits as its factorization.

18878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9441.

The product of its digits is 3584, while the sum is 32.

The square root of 18878 is about 137.3972343244. The cubic root of 18878 is about 26.6267806490.

The spelling of 18878 in words is "eighteen thousand, eight hundred seventy-eight".