216223987 has 8 divisors (see below), whose sum is σ = 249890400. Its totient is φ = 183251904.

The previous prime is 216223981. The next prime is 216224051. The reversal of 216223987 is 789322612.

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 216223987 - 2¹¹ = 216221939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216223981) 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, 172912 + ... + 174157.

It is an arithmetic number, because the mean of its divisors is an integer number (31236300).

Almost surely, 2^216223987 is an apocalyptic number.

216223987 is a deficient number, since it is larger than the sum of its proper divisors (33666413).

216223987 is an equidigital number, since it uses as much as digits as its factorization.

216223987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347165.

The product of its digits is 72576, while the sum is 40.

The square root of 216223987 is about 14704.5566747182. The cubic root of 216223987 is about 600.2073237236.

The spelling of 216223987 in words is "two hundred sixteen million, two hundred twenty-three thousand, nine hundred eighty-seven".