858989857 has 4 divisors (see below), whose sum is σ = 937079856. Its totient is φ = 780899860.

The previous prime is 858989851. The next prime is 858989903. The reversal of 858989857 is 758989858.

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 a cyclic number.

It is not a de Polignac number, because 858989857 - 2³ = 858989849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 858989792 and 858989801.

It is not an unprimeable number, because it can be changed into a prime (858989851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39044983 + ... + 39045004.

It is an arithmetic number, because the mean of its divisors is an integer number (234269964).

Almost surely, 2^858989857 is an apocalyptic number.

It is an amenable number.

858989857 is a deficient number, since it is larger than the sum of its proper divisors (78089999).

858989857 is a wasteful number, since it uses less digits than its factorization.

858989857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78089998.

The product of its digits is 58060800, while the sum is 67.

The square root of 858989857 is about 29308.5287416479. The cubic root of 858989857 is about 950.5960643413.

Subtracting from 858989857 its reverse (758989858), we obtain a palindrome (99999999).

The spelling of 858989857 in words is "eight hundred fifty-eight million, nine hundred eighty-nine thousand, eight hundred fifty-seven".