3996641898 has 64 divisors (see below), whose sum is σ = 9182845440. Its totient is φ = 1303801920.

The previous prime is 3996641893. The next prime is 3996641899. The reversal of 3996641898 is 8981466993.

It is a happy number.

3996641898 is a `hidden beast` number, since 399 + 6 + 64 + 189 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (3996641893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 195858 + ... + 215298.

It is an arithmetic number, because the mean of its divisors is an integer number (143481960).

Almost surely, 2^3996641898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3996641898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4591422720).

3996641898 is an abundant number, since it is smaller than the sum of its proper divisors (5186203542).

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

3996641898 is an equidigital number, since it uses as much as digits as its factorization.

3996641898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19511 (or 19493 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 3996641898 is about 63218.9995017321. Note that the first 3 decimals coincide. The cubic root of 3996641898 is about 1586.9567063779.

Adding to 3996641898 its sum of digits (63), we get a square (3996641961 = 63219²).

The spelling of 3996641898 in words is "three billion, nine hundred ninety-six million, six hundred forty-one thousand, eight hundred ninety-eight".