218871836 has 12 divisors (see below), whose sum is σ = 385376712. Its totient is φ = 108764208.

The previous prime is 218871803. The next prime is 218871857. The reversal of 218871836 is 638178812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167195 + ... + 168498.

It is an arithmetic number, because the mean of its divisors is an integer number (32114726).

Almost surely, 2^218871836 is an apocalyptic number.

It is an amenable number.

218871836 is a deficient number, since it is larger than the sum of its proper divisors (166504876).

218871836 is a wasteful number, since it uses less digits than its factorization.

218871836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335860 (or 335858 counting only the distinct ones).

The product of its digits is 129024, while the sum is 44.

The square root of 218871836 is about 14794.3176929523. The cubic root of 218871836 is about 602.6474089366.

The spelling of 218871836 in words is "two hundred eighteen million, eight hundred seventy-one thousand, eight hundred thirty-six".