3991503880 has 128 divisors (see below), whose sum is σ = 11107918080. Its totient is φ = 1257016320.

The previous prime is 3991503799. The next prime is 3991503883. The reversal of 3991503880 is 883051993.

It is a self number, because there is not a number n which added to its sum of digits gives 3991503880.

It is not an unprimeable number, because it can be changed into a prime (3991503883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 765442 + ... + 770638.

It is an arithmetic number, because the mean of its divisors is an integer number (86780610).

Almost surely, 2^3991503880 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 3991503880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5553959040).

3991503880 is an abundant number, since it is smaller than the sum of its proper divisors (7116414200).

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

3991503880 is a wasteful number, since it uses less digits than its factorization.

3991503880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439 (or 5435 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 3991503880 is about 63178.3497726872. The cubic root of 3991503880 is about 1586.2763594796.

The spelling of 3991503880 in words is "three billion, nine hundred ninety-one million, five hundred three thousand, eight hundred eighty".