218887 has 2 divisors, whose sum is σ = 218888. Its totient is φ = 218886.

The previous prime is 218873. The next prime is 218923. The reversal of 218887 is 788812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218887 - 2¹⁵ = 186119 is a prime.

218887 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109443 + 109444.

It is an arithmetic number, because the mean of its divisors is an integer number (109444).

2²¹⁸⁸⁸⁷ is an apocalyptic number.

218887 is a deficient number, since it is larger than the sum of its proper divisors (1).

218887 is an equidigital number, since it uses as much as digits as its factorization.

218887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 34.

The square root of 218887 is about 467.8536095832. The cubic root of 218887 is about 60.2661326266.

The spelling of 218887 in words is "two hundred eighteen thousand, eight hundred eighty-seven".