853944765 has 64 divisors (see below), whose sum is σ = 1478062080. Its totient is φ = 419471360.

The previous prime is 853944757. The next prime is 853944769. The reversal of 853944765 is 567449358.

It is not a de Polignac number, because 853944765 - 2³ = 853944757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853944769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4334647 + ... + 4334843.

It is an arithmetic number, because the mean of its divisors is an integer number (23094720).

Almost surely, 2^853944765 is an apocalyptic number.

853944765 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

853944765 is a deficient number, since it is larger than the sum of its proper divisors (624117315).

853944765 is a wasteful number, since it uses less digits than its factorization.

853944765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502.

The product of its digits is 3628800, while the sum is 51.

The square root of 853944765 is about 29222.3333257288. Note that the first 4 decimals coincide. The cubic root of 853944765 is about 948.7313684868.

The spelling of 853944765 in words is "eight hundred fifty-three million, nine hundred forty-four thousand, seven hundred sixty-five".