218908 has 6 divisors (see below), whose sum is σ = 383096. Its totient is φ = 109452.

The previous prime is 218887. The next prime is 218923. The reversal of 218908 is 809812.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

218908 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, 27360 + ... + 27367.

2²¹⁸⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

218908 is a deficient number, since it is larger than the sum of its proper divisors (164188).

218908 is a wasteful number, since it uses less digits than its factorization.

218908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54731 (or 54729 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 218908 is about 467.8760519625. The cubic root of 218908 is about 60.2680598742.

The spelling of 218908 in words is "two hundred eighteen thousand, nine hundred eight".