6939864 has 96 divisors (see below), whose sum is σ = 20574000. Its totient is φ = 2166912.

The previous prime is 6939827. The next prime is 6939887. The reversal of 6939864 is 4689396.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77932 + ... + 78020.

Almost surely, 2^6939864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6939864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10287000).

6939864 is an abundant number, since it is smaller than the sum of its proper divisors (13634136).

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

6939864 is a wasteful number, since it uses less digits than its factorization.

6939864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 113 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 6939864 is about 2634.3621618904. The cubic root of 6939864 is about 190.7437514665.

The spelling of 6939864 in words is "six million, nine hundred thirty-nine thousand, eight hundred sixty-four".