3999213 has 20 divisors (see below), whose sum is σ = 6047580. Its totient is φ = 2633472.

The previous prime is 3999211. The next prime is 3999239. The reversal of 3999213 is 3129993.

It can be written as a sum of positive squares in 2 ways, for example, as 2566404 + 1432809 = 1602^2 + 1197^2 .

It is not a de Polignac number, because 3999213 - 2¹ = 3999211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999211) 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 19 ways as a sum of consecutive naturals, for example, 7603 + ... + 8111.

It is an arithmetic number, because the mean of its divisors is an integer number (302379).

Almost surely, 2^3999213 is an apocalyptic number.

It is an amenable number.

3999213 is a deficient number, since it is larger than the sum of its proper divisors (2048367).

3999213 is an equidigital number, since it uses as much as digits as its factorization.

3999213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 609 counting only the distinct ones).

The product of its digits is 13122, while the sum is 36.

The square root of 3999213 is about 1999.8032403214. The cubic root of 3999213 is about 158.7296938087.

The spelling of 3999213 in words is "three million, nine hundred ninety-nine thousand, two hundred thirteen".