216973844 has 12 divisors (see below), whose sum is σ = 399688800. Its totient is φ = 102777048.

The previous prime is 216973837. The next prime is 216973847. The reversal of 216973844 is 448379612.

It is a junction number, because it is equal to n+sod(n) for n = 216973795 and 216973804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216973847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427384 + ... + 1427535.

It is an arithmetic number, because the mean of its divisors is an integer number (33307400).

Almost surely, 2^216973844 is an apocalyptic number.

It is an amenable number.

216973844 is a deficient number, since it is larger than the sum of its proper divisors (182714956).

216973844 is a wasteful number, since it uses less digits than its factorization.

216973844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854942 (or 2854940 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 216973844 is about 14730.0320434139. The cubic root of 216973844 is about 600.9003556644.

The spelling of 216973844 in words is "two hundred sixteen million, nine hundred seventy-three thousand, eight hundred forty-four".