839490857 has 4 divisors (see below), whose sum is σ = 839757456. Its totient is φ = 839224260.

The previous prime is 839490803. The next prime is 839490887. The reversal of 839490857 is 758094938.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 839490857 - 2⁶ = 839490793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 839490799 and 839490808.

It is not an unprimeable number, because it can be changed into a prime (839490887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128519 + ... + 134892.

It is an arithmetic number, because the mean of its divisors is an integer number (209939364).

Almost surely, 2^839490857 is an apocalyptic number.

It is an amenable number.

839490857 is a deficient number, since it is larger than the sum of its proper divisors (266599).

839490857 is a wasteful number, since it uses less digits than its factorization.

839490857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266598.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 839490857 is about 28973.9686097711. The cubic root of 839490857 is about 943.3481241325.

The spelling of 839490857 in words is "eight hundred thirty-nine million, four hundred ninety thousand, eight hundred fifty-seven".