3999646213 has 2 divisors, whose sum is σ = 3999646214. Its totient is φ = 3999646212.

The previous prime is 3999646199. The next prime is 3999646223. The reversal of 3999646213 is 3126469993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2769180129 + 1230466084 = 52623^2 + 35078^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999646213 - 2⁵ = 3999646181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999646223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999823106 + 1999823107.

It is an arithmetic number, because the mean of its divisors is an integer number (1999823107).

Almost surely, 2^3999646213 is an apocalyptic number.

It is an amenable number.

3999646213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999646213 is an equidigital number, since it uses as much as digits as its factorization.

3999646213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 52.

The square root of 3999646213 is about 63242.7562097036. The cubic root of 3999646213 is about 1587.3542504337.

The spelling of 3999646213 in words is "three billion, nine hundred ninety-nine million, six hundred forty-six thousand, two hundred thirteen".