3988813 has 4 divisors (see below), whose sum is σ = 4056480. Its totient is φ = 3921148.

The previous prime is 3988783. The next prime is 3988823. The reversal of 3988813 is 3188893.

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.

It is a cyclic number.

It is not a de Polignac number, because 3988813 - 2⁵ = 3988781 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

3988813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3988823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33745 + ... + 33862.

It is an arithmetic number, because the mean of its divisors is an integer number (1014120).

Almost surely, 2^3988813 is an apocalyptic number.

It is an amenable number.

3988813 is a deficient number, since it is larger than the sum of its proper divisors (67667).

3988813 is an equidigital number, since it uses as much as digits as its factorization.

3988813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67666.

The product of its digits is 41472, while the sum is 40.

The square root of 3988813 is about 1997.2012918081. The cubic root of 3988813 is about 158.5919815595.

The spelling of 3988813 in words is "three million, nine hundred eighty-eight thousand, eight hundred thirteen".