216686829 has 4 divisors (see below), whose sum is σ = 288915776. Its totient is φ = 144457884.

The previous prime is 216686819. The next prime is 216686831. The reversal of 216686829 is 928686612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216686829 - 2¹² = 216682733 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 (216686819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36114469 + ... + 36114474.

It is an arithmetic number, because the mean of its divisors is an integer number (72228944).

Almost surely, 2^216686829 is an apocalyptic number.

It is an amenable number.

216686829 is a deficient number, since it is larger than the sum of its proper divisors (72228947).

216686829 is an equidigital number, since it uses as much as digits as its factorization.

216686829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72228946.

The product of its digits is 497664, while the sum is 48.

The square root of 216686829 is about 14720.2863083569. The cubic root of 216686829 is about 600.6352799061.

The spelling of 216686829 in words is "two hundred sixteen million, six hundred eighty-six thousand, eight hundred twenty-nine".