3891942740 has 144 divisors (see below), whose sum is σ = 9843305472. Its totient is φ = 1264896000.

The previous prime is 3891942739. The next prime is 3891942749. The reversal of 3891942740 is 472491983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3891942749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16149020 + ... + 16149260.

It is an arithmetic number, because the mean of its divisors is an integer number (68356288).

Almost surely, 2^3891942740 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 3891942740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4921652736).

3891942740 is an abundant number, since it is smaller than the sum of its proper divisors (5951362732).

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

3891942740 is a wasteful number, since it uses less digits than its factorization.

3891942740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 3891942740 is about 62385.4369224100. The cubic root of 3891942740 is about 1572.9761848328.

The spelling of 3891942740 in words is "three billion, eight hundred ninety-one million, nine hundred forty-two thousand, seven hundred forty".