3943661280 has 768 divisors, whose sum is σ = 15444172800. Its totient is φ = 836075520.

The previous prime is 3943661221. The next prime is 3943661287. The reversal of 3943661280 is 821663493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943661287) 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 127 ways as a sum of consecutive naturals, for example, 106585422 + ... + 106585458.

It is an arithmetic number, because the mean of its divisors is an integer number (20109600).

Almost surely, 2^3943661280 is an apocalyptic number.

3943661280 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 3943661280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7722086400).

3943661280 is an abundant number, since it is smaller than the sum of its proper divisors (11500511520).

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

3943661280 is a wasteful number, since it uses less digits than its factorization.

3943661280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 3943661280 is about 62798.5770539429. The cubic root of 3943661280 is about 1579.9131074363.

The spelling of 3943661280 in words is "three billion, nine hundred forty-three million, six hundred sixty-one thousand, two hundred eighty".