3921481872 has 240 divisors, whose sum is σ = 13943000448. Its totient is φ = 999198720.

The previous prime is 3921481871. The next prime is 3921481903. The reversal of 3921481872 is 2781841293.

It is a happy number.

3921481872 is a `hidden beast` number, since 3 + 92 + 1 + 481 + 87 + 2 = 666.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (3921481871) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 584328 + ... + 591000.

Almost surely, 2^3921481872 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 3921481872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6971500224).

3921481872 is an abundant number, since it is smaller than the sum of its proper divisors (10021518576).

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

3921481872 is a wasteful number, since it uses less digits than its factorization.

3921481872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6758 (or 6749 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 3921481872 is about 62621.7364179563. The cubic root of 3921481872 is about 1576.9456927328.

The spelling of 3921481872 in words is "three billion, nine hundred twenty-one million, four hundred eighty-one thousand, eight hundred seventy-two".