858794989 has 4 divisors (see below), whose sum is σ = 924856156. Its totient is φ = 792733824.

The previous prime is 858794983. The next prime is 858795037. The reversal of 858794989 is 989497858.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 537776100 + 321018889 = 23190^2 + 17917^2 .

It is a cyclic number.

It is not a de Polignac number, because 858794989 - 2⁵ = 858794957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858794983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33030564 + ... + 33030589.

It is an arithmetic number, because the mean of its divisors is an integer number (231214039).

Almost surely, 2^858794989 is an apocalyptic number.

It is an amenable number.

858794989 is a deficient number, since it is larger than the sum of its proper divisors (66061167).

858794989 is a wasteful number, since it uses less digits than its factorization.

858794989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66061166.

The product of its digits is 52254720, while the sum is 67.

The square root of 858794989 is about 29305.2041282773. The cubic root of 858794989 is about 950.5241757302.

The spelling of 858794989 in words is "eight hundred fifty-eight million, seven hundred ninety-four thousand, nine hundred eighty-nine".