3981939726 has 8 divisors (see below), whose sum is σ = 7963879464. Its totient is φ = 1327313240.

The previous prime is 3981939683. The next prime is 3981939737. The reversal of 3981939726 is 6279391893.

It is a sphenic number, since it is the product of 3 distinct primes.

3981939726 is an admirable number.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 331828305 + ... + 331828316.

It is an arithmetic number, because the mean of its divisors is an integer number (995484933).

Almost surely, 2^3981939726 is an apocalyptic number.

3981939726 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

3981939726 is a wasteful number, since it uses less digits than its factorization.

3981939726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663656626.

The product of its digits is 4408992, while the sum is 57.

The square root of 3981939726 is about 63102.6126717428. The cubic root of 3981939726 is about 1585.0083724808.

The spelling of 3981939726 in words is "three billion, nine hundred eighty-one million, nine hundred thirty-nine thousand, seven hundred twenty-six".