3921103872 has 396 divisors, whose sum is σ = 13894135320. Its totient is φ = 1059028992.

The previous prime is 3921103829. The next prime is 3921103877. The reversal of 3921103872 is 2783011293.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (3921103877) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8579868 + ... + 8580324.

Almost surely, 2^3921103872 is an apocalyptic number.

3921103872 is a gapful number since it is divisible by the number (32) 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 3921103872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6947067660).

3921103872 is an abundant number, since it is smaller than the sum of its proper divisors (9973031448).

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

3921103872 is a wasteful number, since it uses less digits than its factorization.

3921103872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 3921103872 is about 62618.7182238666. The cubic root of 3921103872 is about 1576.8950227187.

The spelling of 3921103872 in words is "three billion, nine hundred twenty-one million, one hundred three thousand, eight hundred seventy-two".