3921172992 has 120 divisors (see below), whose sum is σ = 12345727680. Its totient is φ = 1188218880.

The previous prime is 3921172991. The next prime is 3921172993. The reversal of 3921172992 is 2992711293.

3921172992 is a `hidden beast` number, since 392 + 1 + 172 + 9 + 92 = 666.

It is an interprime number because it is at equal distance from previous prime (3921172991) and next prime (3921172993).

It is not an unprimeable number, because it can be changed into a prime (3921172991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12009 + ... + 89367.

It is an arithmetic number, because the mean of its divisors is an integer number (102881064).

Almost surely, 2^3921172992 is an apocalyptic number.

3921172992 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 3921172992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6172863840).

3921172992 is an abundant number, since it is smaller than the sum of its proper divisors (8424554688).

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

3921172992 is a wasteful number, since it uses less digits than its factorization.

3921172992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77394 (or 77375 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 3921172992 is about 62619.2701330828. The cubic root of 3921172992 is about 1576.9042883360.

The spelling of 3921172992 in words is "three billion, nine hundred twenty-one million, one hundred seventy-two thousand, nine hundred ninety-two".