3921005634 has 64 divisors (see below), whose sum is σ = 9677041920. Its totient is φ = 1031397120.

The previous prime is 3921005609. The next prime is 3921005663. The reversal of 3921005634 is 4365001293.

3921005634 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 3921005595 and 3921005604.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203164 + ... + 221624.

It is an arithmetic number, because the mean of its divisors is an integer number (151203780).

Almost surely, 2^3921005634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3921005634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4838520960).

3921005634 is an abundant number, since it is smaller than the sum of its proper divisors (5756036286).

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

3921005634 is a wasteful number, since it uses less digits than its factorization.

3921005634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18875.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 3921005634 is about 62617.9338049412. The cubic root of 3921005634 is about 1576.8818536119.

The spelling of 3921005634 in words is "three billion, nine hundred twenty-one million, five thousand, six hundred thirty-four".