216984938 has 4 divisors (see below), whose sum is σ = 325477410. Its totient is φ = 108492468.

The previous prime is 216984919. The next prime is 216985001. The reversal of 216984938 is 839489612.

It is a happy number.

216984938 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 204118369 + 12866569 = 14287^2 + 3587^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54246233 + ... + 54246236.

Almost surely, 2^216984938 is an apocalyptic number.

216984938 is a deficient number, since it is larger than the sum of its proper divisors (108492472).

216984938 is a wasteful number, since it uses less digits than its factorization.

216984938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108492471.

The product of its digits is 746496, while the sum is 50.

The square root of 216984938 is about 14730.4086161926. The cubic root of 216984938 is about 600.9105969525.

The spelling of 216984938 in words is "two hundred sixteen million, nine hundred eighty-four thousand, nine hundred thirty-eight".