867856847 has 16 divisors (see below), whose sum is σ = 1023684480. Its totient is φ = 725340000.

The previous prime is 867856841. The next prime is 867856883. The reversal of 867856847 is 748658768.

It is a de Polignac number, because none of the positive numbers 2^k-867856847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867856841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23804 + ... + 47982.

It is an arithmetic number, because the mean of its divisors is an integer number (63980280).

Almost surely, 2^867856847 is an apocalyptic number.

867856847 is a deficient number, since it is larger than the sum of its proper divisors (155827633).

867856847 is a wasteful number, since it uses less digits than its factorization.

867856847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24454.

The product of its digits is 18063360, while the sum is 59.

The square root of 867856847 is about 29459.4101604224. The cubic root of 867856847 is about 953.8557412620.

The spelling of 867856847 in words is "eight hundred sixty-seven million, eight hundred fifty-six thousand, eight hundred forty-seven".