858513987 has 12 divisors (see below), whose sum is σ = 1246503544. Its totient is φ = 569376000.

The previous prime is 858513979. The next prime is 858514001. The reversal of 858513987 is 789315858.

858513987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 858513987 - 2³ = 858513979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (858513967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 245389 + ... + 248862.

Almost surely, 2^858513987 is an apocalyptic number.

858513987 is a deficient number, since it is larger than the sum of its proper divisors (387989557).

858513987 is a wasteful number, since it uses less digits than its factorization.

858513987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494450 (or 494447 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 54.

The square root of 858513987 is about 29300.4093316117. The cubic root of 858513987 is about 950.4204923384.

The spelling of 858513987 in words is "eight hundred fifty-eight million, five hundred thirteen thousand, nine hundred eighty-seven".