216943746 has 8 divisors (see below), whose sum is σ = 433887504. Its totient is φ = 72314580.

The previous prime is 216943739. The next prime is 216943759. The reversal of 216943746 is 647349612.

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

216943746 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 216943698 and 216943707.

It is an unprimeable number.

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, 18078640 + ... + 18078651.

It is an arithmetic number, because the mean of its divisors is an integer number (54235938).

Almost surely, 2^216943746 is an apocalyptic number.

216943746 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216943746 is a wasteful number, since it uses less digits than its factorization.

216943746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36157296.

The product of its digits is 217728, while the sum is 42.

The square root of 216943746 is about 14729.0103537203. The cubic root of 216943746 is about 600.8725693117.

The spelling of 216943746 in words is "two hundred sixteen million, nine hundred forty-three thousand, seven hundred forty-six".