216803399 has 4 divisors (see below), whose sum is σ = 219857040. Its totient is φ = 213749760.

The previous prime is 216803383. The next prime is 216803423. The reversal of 216803399 is 993308612.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 216803399 - 2⁴ = 216803383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216803369) 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, 1526714 + ... + 1526855.

It is an arithmetic number, because the mean of its divisors is an integer number (54964260).

Almost surely, 2^216803399 is an apocalyptic number.

216803399 is a deficient number, since it is larger than the sum of its proper divisors (3053641).

216803399 is an equidigital number, since it uses as much as digits as its factorization.

216803399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3053640.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 216803399 is about 14724.2452777723. The cubic root of 216803399 is about 600.7429675818.

The spelling of 216803399 in words is "two hundred sixteen million, eight hundred three thousand, three hundred ninety-nine".