216986843 has 8 divisors (see below), whose sum is σ = 218670480. Its totient is φ = 215308800.

The previous prime is 216986813. The next prime is 216986867. The reversal of 216986843 is 348689612.

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

It is a cyclic number.

It is not a de Polignac number, because 216986843 - 2⁶ = 216986779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216986813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106571 + ... + 108587.

It is an arithmetic number, because the mean of its divisors is an integer number (27333810).

Almost surely, 2^216986843 is an apocalyptic number.

216986843 is a deficient number, since it is larger than the sum of its proper divisors (1683637).

216986843 is a wasteful number, since it uses less digits than its factorization.

216986843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2797.

The product of its digits is 497664, while the sum is 47.

The square root of 216986843 is about 14730.4732782080. The cubic root of 216986843 is about 600.9123554944.

The spelling of 216986843 in words is "two hundred sixteen million, nine hundred eighty-six thousand, eight hundred forty-three".