216617938 has 4 divisors (see below), whose sum is σ = 324926910. Its totient is φ = 108308968.

The previous prime is 216617923. The next prime is 216617939. The reversal of 216617938 is 839716612.

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., 112720689 + 103897249 = 10617^2 + 10193^2 .

It is a junction number, because it is equal to n+sod(n) for n = 216617894 and 216617903.

It is not an unprimeable number, because it can be changed into a prime (216617939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54154483 + ... + 54154486.

Almost surely, 2^216617938 is an apocalyptic number.

216617938 is a deficient number, since it is larger than the sum of its proper divisors (108308972).

216617938 is a wasteful number, since it uses less digits than its factorization.

216617938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108308971.

The product of its digits is 108864, while the sum is 43.

The square root of 216617938 is about 14717.9461202982. The cubic root of 216617938 is about 600.5716200594.

The spelling of 216617938 in words is "two hundred sixteen million, six hundred seventeen thousand, nine hundred thirty-eight".