3961641940 has 12 divisors (see below), whose sum is σ = 8319448116. Its totient is φ = 1584656768.

The previous prime is 3961641917. The next prime is 3961641941. The reversal of 3961641940 is 491461693.

It can be written as a sum of positive squares in 2 ways, for example, as 1238054596 + 2723587344 = 35186^2 + 52188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3961641941) by changing a digit.

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, 99041029 + ... + 99041068.

It is an arithmetic number, because the mean of its divisors is an integer number (693287343).

Almost surely, 2^3961641940 is an apocalyptic number.

It is an amenable number.

3961641940 is an abundant number, since it is smaller than the sum of its proper divisors (4357806176).

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

3961641940 is a wasteful number, since it uses less digits than its factorization.

3961641940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198082106 (or 198082104 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 3961641940 is about 62941.5756078603. The cubic root of 3961641940 is about 1582.3106101036.

The spelling of 3961641940 in words is "three billion, nine hundred sixty-one million, six hundred forty-one thousand, nine hundred forty".