853991636 has 6 divisors (see below), whose sum is σ = 1494485370. Its totient is φ = 426995816.

The previous prime is 853991629. The next prime is 853991639. The reversal of 853991636 is 636199358.

853991636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 742562500 + 111429136 = 27250^2 + 10556^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853991639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106748951 + ... + 106748958.

It is an arithmetic number, because the mean of its divisors is an integer number (249080895).

Almost surely, 2^853991636 is an apocalyptic number.

It is an amenable number.

853991636 is a deficient number, since it is larger than the sum of its proper divisors (640493734).

853991636 is a wasteful number, since it uses less digits than its factorization.

853991636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213497913 (or 213497911 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 50.

The square root of 853991636 is about 29223.1352869606. The cubic root of 853991636 is about 948.7487260397.

The spelling of 853991636 in words is "eight hundred fifty-three million, nine hundred ninety-one thousand, six hundred thirty-six".