3988247813 has 4 divisors (see below), whose sum is σ = 4350815808. Its totient is φ = 3625679820.

The previous prime is 3988247777. The next prime is 3988247873. The reversal of 3988247813 is 3187428893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3187428893 = 11 ⋅289766263.

It is a cyclic number.

It is not a de Polignac number, because 3988247813 - 2⁶ = 3988247749 is a prime.

It is a super-2 number, since 2×3988247813² = 31812241235798565938, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988247873) 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, 181283981 + ... + 181284002.

It is an arithmetic number, because the mean of its divisors is an integer number (1087703952).

Almost surely, 2^3988247813 is an apocalyptic number.

It is an amenable number.

3988247813 is a deficient number, since it is larger than the sum of its proper divisors (362567995).

3988247813 is a wasteful number, since it uses less digits than its factorization.

3988247813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362567994.

The product of its digits is 2322432, while the sum is 53.

The square root of 3988247813 is about 63152.5756640218. The cubic root of 3988247813 is about 1585.8449074627.

The spelling of 3988247813 in words is "three billion, nine hundred eighty-eight million, two hundred forty-seven thousand, eight hundred thirteen".