3998990844 has 48 divisors (see below), whose sum is σ = 10725271200. Its totient is φ = 1287030528.

The previous prime is 3998990837. The next prime is 3998990893. The reversal of 3998990844 is 4480998993.

3998990844 is a `hidden beast` number, since 399 + 89 + 90 + 84 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635277 + ... + 641540.

It is an arithmetic number, because the mean of its divisors is an integer number (223443150).

Almost surely, 2^3998990844 is an apocalyptic number.

It is an amenable number.

3998990844 is an abundant number, since it is smaller than the sum of its proper divisors (6726280356).

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

3998990844 is a wasteful number, since it uses less digits than its factorization.

3998990844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276859 (or 1276851 counting only the distinct ones).

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

The square root of 3998990844 is about 63237.5746214227. The cubic root of 3998990844 is about 1587.2675461322.

The spelling of 3998990844 in words is "three billion, nine hundred ninety-eight million, nine hundred ninety thousand, eight hundred forty-four".