3971816604 has 144 divisors (see below), whose sum is σ = 11785213440. Its totient is φ = 1104243840.

The previous prime is 3971816603. The next prime is 3971816623. The reversal of 3971816604 is 4066181793.

It is a happy number.

3971816604 is a `hidden beast` number, since 39 + 7 + 1 + 8 + 1 + 6 + 604 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 3971816604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971816603) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3889614 + ... + 3890634.

It is an arithmetic number, because the mean of its divisors is an integer number (81841760).

Almost surely, 2^3971816604 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 3971816604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5892606720).

3971816604 is an abundant number, since it is smaller than the sum of its proper divisors (7813396836).

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

3971816604 is a wasteful number, since it uses less digits than its factorization.

3971816604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440 (or 1435 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 3971816604 is about 63022.3500355231. The cubic root of 3971816604 is about 1583.6640653915.

The spelling of 3971816604 in words is "three billion, nine hundred seventy-one million, eight hundred sixteen thousand, six hundred four".