218969812 has 12 divisors (see below), whose sum is σ = 384562836. Its totient is φ = 109094720.

The previous prime is 218969791. The next prime is 218969921.

218969812 is nontrivially palindromic in base 10.

218969812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 178596496 + 40373316 = 13364^2 + 6354^2 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96283 + ... + 98530.

It is an arithmetic number, because the mean of its divisors is an integer number (32046903).

Almost surely, 2^218969812 is an apocalyptic number.

It is an amenable number.

218969812 is a deficient number, since it is larger than the sum of its proper divisors (165593024).

218969812 is a wasteful number, since it uses less digits than its factorization.

218969812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195098 (or 195096 counting only the distinct ones).

The product of its digits is 124416, while the sum is 46.

The square root of 218969812 is about 14797.6285937984. The cubic root of 218969812 is about 602.7373187449.

The spelling of 218969812 in words is "two hundred eighteen million, nine hundred sixty-nine thousand, eight hundred twelve".