853989813 has 24 divisors (see below), whose sum is σ = 1258278840. Its totient is φ = 557976960.

The previous prime is 853989811. The next prime is 853989823. The reversal of 853989813 is 318989358.

853989813 is a `hidden beast` number, since 8 + 539 + 8 + 98 + 13 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6084 + 853983729 = 78^2 + 29223^2 .

It is not a de Polignac number, because 853989813 - 2¹ = 853989811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 853989813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853989811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158203 + ... + 163511.

It is an arithmetic number, because the mean of its divisors is an integer number (52428285).

Almost surely, 2^853989813 is an apocalyptic number.

It is an amenable number.

853989813 is a deficient number, since it is larger than the sum of its proper divisors (404289027).

853989813 is a wasteful number, since it uses less digits than its factorization.

853989813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5669 (or 5666 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The square root of 853989813 is about 29223.1040959033. The cubic root of 853989813 is about 948.7480509472.

The spelling of 853989813 in words is "eight hundred fifty-three million, nine hundred eighty-nine thousand, eight hundred thirteen".