216992843 has 8 divisors (see below), whose sum is σ = 222588480. Its totient is φ = 211438080.

The previous prime is 216992837. The next prime is 216992851. The reversal of 216992843 is 348299612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216992843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216992794 and 216992803.

It is not an unprimeable number, because it can be changed into a prime (216992813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683 + ... + 20843.

It is an arithmetic number, because the mean of its divisors is an integer number (27823560).

Almost surely, 2^216992843 is an apocalyptic number.

216992843 is a deficient number, since it is larger than the sum of its proper divisors (5595637).

216992843 is a wasteful number, since it uses less digits than its factorization.

216992843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20437.

The product of its digits is 186624, while the sum is 44.

The square root of 216992843 is about 14730.6769362443. The cubic root of 216992843 is about 600.9178941419.

It can be divided in two parts, 21699 and 2843, that added together give a palindrome (24542).

The spelling of 216992843 in words is "two hundred sixteen million, nine hundred ninety-two thousand, eight hundred forty-three".