858716989 has 8 divisors (see below), whose sum is σ = 973444640. Its totient is φ = 750942576.

The previous prime is 858716909. The next prime is 858717007. The reversal of 858716989 is 989617858.

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 858716989 - 2²¹ = 856619837 is a prime.

It is a super-2 number, since 2×858716989² = 1474789734394452242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858716909) 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, 1738047 + ... + 1738540.

It is an arithmetic number, because the mean of its divisors is an integer number (121680580).

Almost surely, 2^858716989 is an apocalyptic number.

It is an amenable number.

858716989 is a deficient number, since it is larger than the sum of its proper divisors (114727651).

858716989 is a wasteful number, since it uses less digits than its factorization.

858716989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476619.

The product of its digits is 8709120, while the sum is 61.

The square root of 858716989 is about 29303.8732764118. The cubic root of 858716989 is about 950.4953977597.

The spelling of 858716989 in words is "eight hundred fifty-eight million, seven hundred sixteen thousand, nine hundred eighty-nine".