218534416 has 10 divisors (see below), whose sum is σ = 423410462. Its totient is φ = 109267200.

The previous prime is 218534399. The next prime is 218534497. The reversal of 218534416 is 614435812.

It can be written as a sum of positive squares in only one way, i.e., 207244816 + 11289600 = 14396^2 + 3360^2 .

It is a super-2 number, since 2×218534416² = 95514581952922112, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6829185 + ... + 6829216.

Almost surely, 2^218534416 is an apocalyptic number.

It is an amenable number.

218534416 is a deficient number, since it is larger than the sum of its proper divisors (204876046).

218534416 is a wasteful number, since it uses less digits than its factorization.

218534416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13658409 (or 13658403 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 218534416 is about 14782.9095918226. The cubic root of 218534416 is about 602.3375626561.

The spelling of 218534416 in words is "two hundred eighteen million, five hundred thirty-four thousand, four hundred sixteen".