856872889838 has 16 divisors (see below), whose sum is σ = 1469333869920. Its totient is φ = 367129009536.

The previous prime is 856872889819. The next prime is 856872889879. The reversal of 856872889838 is 838988278658.

It is a super-2 number, since 2×856872889838² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8466983 + ... + 8567586.

It is an arithmetic number, because the mean of its divisors is an integer number (91833366870).

Almost surely, 2^856872889838 is an apocalyptic number.

856872889838 is a deficient number, since it is larger than the sum of its proper divisors (612460980082).

856872889838 is a wasteful number, since it uses less digits than its factorization.

856872889838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17038171.

The product of its digits is 2972712960, while the sum is 80.

The spelling of 856872889838 in words is "eight hundred fifty-six billion, eight hundred seventy-two million, eight hundred eighty-nine thousand, eight hundred thirty-eight".