3921799680 has 200 divisors, whose sum is σ = 14047389972. Its totient is φ = 1045757952.

The previous prime is 3921799643. The next prime is 3921799733. The reversal of 3921799680 is 869971293.

3921799680 is a `hidden beast` number, since 392 + 179 + 9 + 6 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3710271744 + 211527936 = 60912^2 + 14544^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 197904 + ... + 216816.

Almost surely, 2^3921799680 is an apocalyptic number.

3921799680 is a gapful number since it is divisible by the number (30) 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 3921799680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7023694986).

3921799680 is an abundant number, since it is smaller than the sum of its proper divisors (10125590292).

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

3921799680 is an equidigital number, since it uses as much as digits as its factorization.

3921799680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18948 (or 18923 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 3921799680 is about 62624.2738880061. The cubic root of 3921799680 is about 1576.9882916308.

The spelling of 3921799680 in words is "three billion, nine hundred twenty-one million, seven hundred ninety-nine thousand, six hundred eighty".