218088923 has 6 divisors (see below), whose sum is σ = 236155644. Its totient is φ = 201312696.

The previous prime is 218088917. The next prime is 218088929. The reversal of 218088923 is 329880812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (218088917) and next prime (218088929).

It is not a de Polignac number, because 218088923 - 2⁸ = 218088667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218088929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 645065 + ... + 645402.

It is an arithmetic number, because the mean of its divisors is an integer number (39359274).

Almost surely, 2^218088923 is an apocalyptic number.

218088923 is a deficient number, since it is larger than the sum of its proper divisors (18066721).

218088923 is a wasteful number, since it uses less digits than its factorization.

218088923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290493 (or 1290480 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 218088923 is about 14767.8340659692. The cubic root of 218088923 is about 601.9279861098.

The spelling of 218088923 in words is "two hundred eighteen million, eighty-eight thousand, nine hundred twenty-three".