853640443 has 2 divisors, whose sum is σ = 853640444. Its totient is φ = 853640442.

The previous prime is 853640441. The next prime is 853640453. The reversal of 853640443 is 344046358.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 853640443 - 2¹ = 853640441 is a prime.

Together with 853640441, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (853640441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 426820221 + 426820222.

It is an arithmetic number, because the mean of its divisors is an integer number (426820222).

Almost surely, 2^853640443 is an apocalyptic number.

853640443 is a deficient number, since it is larger than the sum of its proper divisors (1).

853640443 is an equidigital number, since it uses as much as digits as its factorization.

853640443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 853640443 is about 29217.1258511168. The cubic root of 853640443 is about 948.6186546660.

The spelling of 853640443 in words is "eight hundred fifty-three million, six hundred forty thousand, four hundred forty-three".