216005830 has 16 divisors (see below), whose sum is σ = 401353344. Its totient is φ = 83615040.

The previous prime is 216005821. The next prime is 216005837. The reversal of 216005830 is 38500612.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 216005795 and 216005804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216005837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348087 + ... + 348706.

It is an arithmetic number, because the mean of its divisors is an integer number (25084584).

Almost surely, 2^216005830 is an apocalyptic number.

216005830 is a deficient number, since it is larger than the sum of its proper divisors (185347514).

216005830 is a wasteful number, since it uses less digits than its factorization.

216005830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696831.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 216005830 is about 14697.1367959885. The cubic root of 216005830 is about 600.0053980996.

The spelling of 216005830 in words is "two hundred sixteen million, five thousand, eight hundred thirty".