216117838 has 8 divisors (see below), whose sum is σ = 343246032. Its totient is φ = 101702496.

The previous prime is 216117829. The next prime is 216117841. The reversal of 216117838 is 838711612.

216117838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 216117797 and 216117806.

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, 3178170 + ... + 3178237.

It is an arithmetic number, because the mean of its divisors is an integer number (42905754).

Almost surely, 2^216117838 is an apocalyptic number.

216117838 is a deficient number, since it is larger than the sum of its proper divisors (127128194).

216117838 is a wasteful number, since it uses less digits than its factorization.

216117838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6356426.

The product of its digits is 16128, while the sum is 37.

The square root of 216117838 is about 14700.9468402549. The cubic root of 216117838 is about 600.1090894239.

The spelling of 216117838 in words is "two hundred sixteen million, one hundred seventeen thousand, eight hundred thirty-eight".