856872889839 has 16 divisors (see below), whose sum is σ = 1269625119840. Its totient is φ = 571165882560.

The previous prime is 856872889819. The next prime is 856872889879. The reversal of 856872889839 is 938988278658.

It is not a de Polignac number, because 856872889839 - 2¹⁶ = 856872824303 is a prime.

It is a super-2 number, since 2×856872889839² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856872889819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2107302 + ... + 2480819.

It is an arithmetic number, because the mean of its divisors is an integer number (79351569990).

Almost surely, 2^856872889839 is an apocalyptic number.

856872889839 is a deficient number, since it is larger than the sum of its proper divisors (412752230001).

856872889839 is a wasteful number, since it uses less digits than its factorization.

856872889839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4595047 (or 4595041 counting only the distinct ones).

The product of its digits is 3344302080, while the sum is 81.

The spelling of 856872889839 in words is "eight hundred fifty-six billion, eight hundred seventy-two million, eight hundred eighty-nine thousand, eight hundred thirty-nine".