870849839 has 2 divisors, whose sum is σ = 870849840. Its totient is φ = 870849838.

The previous prime is 870849827. The next prime is 870849841. The reversal of 870849839 is 938948078.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 870849839 - 2⁸ = 870849583 is a prime.

Together with 870849841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (870849899) 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 as a sum of consecutive naturals, namely, 435424919 + 435424920.

It is an arithmetic number, because the mean of its divisors is an integer number (435424920).

Almost surely, 2^870849839 is an apocalyptic number.

870849839 is a deficient number, since it is larger than the sum of its proper divisors (1).

870849839 is an equidigital number, since it uses as much as digits as its factorization.

870849839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The square root of 870849839 is about 29510.1650113990. The cubic root of 870849839 is about 954.9510090636.

The spelling of 870849839 in words is "eight hundred seventy million, eight hundred forty-nine thousand, eight hundred thirty-nine".