3939858531840 has 960 divisors, whose sum is σ = 16825139907840. Its totient is φ = 775568424960.

The previous prime is 3939858531823. The next prime is 3939858531841. The reversal of 3939858531840 is 481358589393.

It is a tau number, because it is divible by the number of its divisors (960).

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3939858531841) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 78625834 + ... + 78675926.

It is an arithmetic number, because the mean of its divisors is an integer number (17526187404).

Almost surely, 2^{3939858531840} is an apocalyptic number.

3939858531840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3939858531840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8412569953920).

3939858531840 is an abundant number, since it is smaller than the sum of its proper divisors (12885281376000).

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

3939858531840 is a wasteful number, since it uses less digits than its factorization.

3939858531840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50163 (or 50140 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 66.

The spelling of 3939858531840 in words is "three trillion, nine hundred thirty-nine billion, eight hundred fifty-eight million, five hundred thirty-one thousand, eight hundred forty".