838905665 has 8 divisors (see below), whose sum is σ = 1084124328. Its totient is φ = 619499520.

The previous prime is 838905659. The next prime is 838905667. The reversal of 838905665 is 566509838.

It can be written as a sum of positive squares in 4 ways, for example, as 2076481 + 836829184 = 1441^2 + 28928^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 838905665 - 2²⁰ = 837857089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (838905667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6453056 + ... + 6453185.

It is an arithmetic number, because the mean of its divisors is an integer number (135515541).

Almost surely, 2^838905665 is an apocalyptic number.

It is an amenable number.

838905665 is a deficient number, since it is larger than the sum of its proper divisors (245218663).

838905665 is a wasteful number, since it uses less digits than its factorization.

838905665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12906259.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 838905665 is about 28963.8682672049. The cubic root of 838905665 is about 943.1288769176.

The spelling of 838905665 in words is "eight hundred thirty-eight million, nine hundred five thousand, six hundred sixty-five".