839891644 has 12 divisors (see below), whose sum is σ = 1533715344. Its totient is φ = 401687264.

The previous prime is 839891641. The next prime is 839891651. The reversal of 839891644 is 446198938.

It is a happy number.

It is a super-2 number, since 2×839891644² = 1410835947322045472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 839891591 and 839891600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (839891641) 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 3 ways as a sum of consecutive naturals, for example, 4564537 + ... + 4564720.

It is an arithmetic number, because the mean of its divisors is an integer number (127809612).

Almost surely, 2^839891644 is an apocalyptic number.

It is an amenable number.

839891644 is a deficient number, since it is larger than the sum of its proper divisors (693823700).

839891644 is a wasteful number, since it uses less digits than its factorization.

839891644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9129284 (or 9129282 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 52.

The square root of 839891644 is about 28980.8841134980. The cubic root of 839891644 is about 943.4982236482.

The spelling of 839891644 in words is "eight hundred thirty-nine million, eight hundred ninety-one thousand, six hundred forty-four".