3943813 has 8 divisors (see below), whose sum is σ = 4214808. Its totient is φ = 3677184.

The previous prime is 3943799. The next prime is 3943829. The reversal of 3943813 is 3183493.

3943813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 191844 + 3751969 = 438^2 + 1937^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3943813 - 2⁹ = 3943301 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 (3943843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 895 + ... + 2947.

It is an arithmetic number, because the mean of its divisors is an integer number (526851).

Almost surely, 2^3943813 is an apocalyptic number.

It is an amenable number.

3943813 is a deficient number, since it is larger than the sum of its proper divisors (270995).

3943813 is a wasteful number, since it uses less digits than its factorization.

3943813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183.

The product of its digits is 7776, while the sum is 31.

The square root of 3943813 is about 1985.9035726842. The cubic root of 3943813 is about 157.9933367911.

It can be divided in two parts, 394381 and 3, that added together give a square (394384 = 628²).

The spelling of 3943813 in words is "three million, nine hundred forty-three thousand, eight hundred thirteen".