858168638 has 16 divisors (see below), whose sum is σ = 1334000880. Its totient is φ = 413554176.

The previous prime is 858168631. The next prime is 858168659. The reversal of 858168638 is 836861858.

It is a super-2 number, since 2×858168638² = 1472906822493550088, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 858168638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858168631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20645 + ... + 46287.

It is an arithmetic number, because the mean of its divisors is an integer number (83375055).

Almost surely, 2^858168638 is an apocalyptic number.

858168638 is a deficient number, since it is larger than the sum of its proper divisors (475832242).

858168638 is a wasteful number, since it uses less digits than its factorization.

858168638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26251.

The product of its digits is 2211840, while the sum is 53.

The square root of 858168638 is about 29294.5154935186. The cubic root of 858168638 is about 950.2930353633.

The spelling of 858168638 in words is "eight hundred fifty-eight million, one hundred sixty-eight thousand, six hundred thirty-eight".