858144685 has 4 divisors (see below), whose sum is σ = 1029773628. Its totient is φ = 686515744.

The previous prime is 858144673. The next prime is 858144731. The reversal of 858144685 is 586441858.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 586441858 = 2 ⋅293220929.

It can be written as a sum of positive squares in 2 ways, for example, as 596287561 + 261857124 = 24419^2 + 16182^2 .

It is a cyclic number.

It is not a de Polignac number, because 858144685 - 2¹³ = 858136493 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85814464 + ... + 85814473.

It is an arithmetic number, because the mean of its divisors is an integer number (257443407).

Almost surely, 2^858144685 is an apocalyptic number.

It is an amenable number.

858144685 is a deficient number, since it is larger than the sum of its proper divisors (171628943).

858144685 is a wasteful number, since it uses less digits than its factorization.

858144685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171628942.

The product of its digits is 1228800, while the sum is 49.

The square root of 858144685 is about 29294.1066598727. The cubic root of 858144685 is about 950.2841938296.

The spelling of 858144685 in words is "eight hundred fifty-eight million, one hundred forty-four thousand, six hundred eighty-five".