858172209 has 8 divisors (see below), whose sum is σ = 1150844352. Its totient is φ = 568807440.

The previous prime is 858172187. The next prime is 858172213. The reversal of 858172209 is 902271858.

858172209 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 not a de Polignac number, because 858172209 - 2⁸ = 858171953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (858177209) 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, 826237 + ... + 827274.

It is an arithmetic number, because the mean of its divisors is an integer number (143855544).

Almost surely, 2^858172209 is an apocalyptic number.

It is an amenable number.

858172209 is a deficient number, since it is larger than the sum of its proper divisors (292672143).

858172209 is a wasteful number, since it uses less digits than its factorization.

858172209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653687.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 858172209 is about 29294.5764434306. The cubic root of 858172209 is about 950.2943534771.

The spelling of 858172209 in words is "eight hundred fifty-eight million, one hundred seventy-two thousand, two hundred nine".