6919986438 has 128 divisors (see below), whose sum is σ = 16381440000. Its totient is φ = 2161676160.

The previous prime is 6919986419. The next prime is 6919986481. The reversal of 6919986438 is 8346899196.

It is a happy number.

6919986438 is a `hidden beast` number, since 6 + 9 + 199 + 8 + 6 + 438 = 666.

It is a congruent number.

It is an unprimeable number.

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 in 63 ways as a sum of consecutive naturals, for example, 10966383 + ... + 10967013.

It is an arithmetic number, because the mean of its divisors is an integer number (127980000).

Almost surely, 2^6919986438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6919986438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8190720000).

6919986438 is an abundant number, since it is smaller than the sum of its proper divisors (9461453562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6919986438 is a wasteful number, since it uses less digits than its factorization.

6919986438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867 (or 861 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 6919986438 is about 83186.4558567078. The cubic root of 6919986438 is about 1905.6146420161.

The spelling of 6919986438 in words is "six billion, nine hundred nineteen million, nine hundred eighty-six thousand, four hundred thirty-eight".