3998786399 has 4 divisors (see below), whose sum is σ = 4000953264. Its totient is φ = 3996619536.

The previous prime is 3998786383. The next prime is 3998786437. The reversal of 3998786399 is 9936878993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9936878993 = 2027 ⋅4902259.

It is a cyclic number.

It is not a de Polignac number, because 3998786399 - 2⁴ = 3998786383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998786329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1080662 + ... + 1084355.

It is an arithmetic number, because the mean of its divisors is an integer number (1000238316).

Almost surely, 2^3998786399 is an apocalyptic number.

3998786399 is a deficient number, since it is larger than the sum of its proper divisors (2166865).

3998786399 is a wasteful number, since it uses less digits than its factorization.

3998786399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166864.

The product of its digits is 158723712, while the sum is 71.

The square root of 3998786399 is about 63235.9581171978. The cubic root of 3998786399 is about 1587.2404964376.

The spelling of 3998786399 in words is "three billion, nine hundred ninety-eight million, seven hundred eighty-six thousand, three hundred ninety-nine".