3946813 has 18 divisors (see below), whose sum is σ = 4645914. Its totient is φ = 3332448.

The previous prime is 3946801. The next prime is 3946829. The reversal of 3946813 is 3186493.

It can be written as a sum of positive squares in 3 ways, for example, as 190969 + 3755844 = 437^2 + 1938^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3946813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3946843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 136083 + ... + 136111.

Almost surely, 2^3946813 is an apocalyptic number.

It is an amenable number.

3946813 is a deficient number, since it is larger than the sum of its proper divisors (699101).

3946813 is a wasteful number, since it uses less digits than its factorization.

3946813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 61 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 3946813 is about 1986.6587527807. The cubic root of 3946813 is about 158.0333876993.

The spelling of 3946813 in words is "three million, nine hundred forty-six thousand, eight hundred thirteen".