3901919818212 has 216 divisors, whose sum is σ = 10747130121000. Its totient is φ = 1193097185280.

The previous prime is 3901919818207. The next prime is 3901919818219. The reversal of 3901919818212 is 2128189191093.

It is a happy number.

3901919818212 is a `hidden beast` number, since 390 + 1 + 91 + 9 + 81 + 82 + 12 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 2522455474176 + 1379464344036 = 1588224^2 + 1174506^2 .

It is a super-3 number, since 3×3901919818212³ (a number of 39 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (3901919818219) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 678709914 + ... + 678715662.

Almost surely, 2^{3901919818212} 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 3901919818212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5373565060500).

3901919818212 is an abundant number, since it is smaller than the sum of its proper divisors (6845210302788).

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

3901919818212 is a wasteful number, since it uses less digits than its factorization.

3901919818212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6463 (or 6445 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 54.

The spelling of 3901919818212 in words is "three trillion, nine hundred one billion, nine hundred nineteen million, eight hundred eighteen thousand, two hundred twelve".