3991913604 has 384 divisors, whose sum is σ = 13048627200. Its totient is φ = 1043041536.

The previous prime is 3991913593. The next prime is 3991913641. The reversal of 3991913604 is 4063191993.

3991913604 is a `hidden beast` number, since 39 + 9 + 1 + 9 + 1 + 3 + 604 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 3991913604.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 54683712 + ... + 54683784.

It is an arithmetic number, because the mean of its divisors is an integer number (33980800).

Almost surely, 2^3991913604 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 3991913604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6524313600).

3991913604 is an abundant number, since it is smaller than the sum of its proper divisors (9056713596).

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

3991913604 is a wasteful number, since it uses less digits than its factorization.

3991913604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 3991913604 is about 63181.5922876276. The cubic root of 3991913604 is about 1586.3306341989.

The spelling of 3991913604 in words is "three billion, nine hundred ninety-one million, nine hundred thirteen thousand, six hundred four".