3951861280 has 96 divisors (see below), whose sum is σ = 9472256640. Its totient is φ = 1557903360.

The previous prime is 3951861253. The next prime is 3951861341. The reversal of 3951861280 is 821681593.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3499756 + ... + 3500884.

It is an arithmetic number, because the mean of its divisors is an integer number (98669340).

Almost surely, 2^3951861280 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 3951861280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4736128320).

3951861280 is an abundant number, since it is smaller than the sum of its proper divisors (5520395360).

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

3951861280 is a wasteful number, since it uses less digits than its factorization.

3951861280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442 (or 1434 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 3951861280 is about 62863.8312545457. The cubic root of 3951861280 is about 1581.0073797948.

The spelling of 3951861280 in words is "three billion, nine hundred fifty-one million, eight hundred sixty-one thousand, two hundred eighty".