820857229 has 8 divisors (see below), whose sum is σ = 843226560. Its totient is φ = 798637056.

The previous prime is 820857221. The next prime is 820857239. The reversal of 820857229 is 922758028.

820857229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 820857229 - 2³ = 820857221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820857221) 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, 26089 + ... + 48190.

It is an arithmetic number, because the mean of its divisors is an integer number (105403320).

Almost surely, 2^820857229 is an apocalyptic number.

It is an amenable number.

820857229 is a deficient number, since it is larger than the sum of its proper divisors (22369331).

820857229 is a wasteful number, since it uses less digits than its factorization.

820857229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74579.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 820857229 is about 28650.6060843396. The cubic root of 820857229 is about 936.3162104758.

The spelling of 820857229 in words is "eight hundred twenty million, eight hundred fifty-seven thousand, two hundred twenty-nine".