218706489 has 12 divisors (see below), whose sum is σ = 316303936. Its totient is φ = 145622232.

The previous prime is 218706469. The next prime is 218706491. The reversal of 218706489 is 984607812.

It is not a de Polignac number, because 218706489 - 2⁷ = 218706361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218706409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7357 + ... + 22170.

Almost surely, 2^218706489 is an apocalyptic number.

It is an amenable number.

218706489 is a deficient number, since it is larger than the sum of its proper divisors (97597447).

218706489 is a wasteful number, since it uses less digits than its factorization.

218706489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30356 (or 30353 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 218706489 is about 14788.7284443254. The cubic root of 218706489 is about 602.4956137947.

The spelling of 218706489 in words is "two hundred eighteen million, seven hundred six thousand, four hundred eighty-nine".