18878141 has 2 divisors, whose sum is σ = 18878142. Its totient is φ = 18878140.

The previous prime is 18878129. The next prime is 18878173. The reversal of 18878141 is 14187881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 6522916 = 3515^2 + 2554^2 .

It is an emirp because it is prime and its reverse (14187881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18878141 - 2¹⁸ = 18615997 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18878095 and 18878104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15878141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9439070 + 9439071.

It is an arithmetic number, because the mean of its divisors is an integer number (9439071).

Almost surely, 2^18878141 is an apocalyptic number.

It is an amenable number.

18878141 is a deficient number, since it is larger than the sum of its proper divisors (1).

18878141 is an equidigital number, since it uses as much as digits as its factorization.

18878141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 38.

The square root of 18878141 is about 4344.8982726872. The cubic root of 18878141 is about 266.2684694073.

The spelling of 18878141 in words is "eighteen million, eight hundred seventy-eight thousand, one hundred forty-one".