216858923 has 8 divisors (see below), whose sum is σ = 219935520. Its totient is φ = 213799680.

The previous prime is 216858907. The next prime is 216858931. The reversal of 216858923 is 329858612.

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 216858923 - 2⁴ = 216858907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216858223) 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 7 ways as a sum of consecutive naturals, for example, 21938 + ... + 30248.

It is an arithmetic number, because the mean of its divisors is an integer number (27491940).

Almost surely, 2^216858923 is an apocalyptic number.

216858923 is a deficient number, since it is larger than the sum of its proper divisors (3076597).

216858923 is an equidigital number, since it uses as much as digits as its factorization.

216858923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8677.

The product of its digits is 207360, while the sum is 44.

The square root of 216858923 is about 14726.1306187335. The cubic root of 216858923 is about 600.7942472291.

It can be divided in two parts, 2168589 and 23, that added together give a palindrome (2168612).

The spelling of 216858923 in words is "two hundred sixteen million, eight hundred fifty-eight thousand, nine hundred twenty-three".