3994213 has 2 divisors, whose sum is σ = 3994214. Its totient is φ = 3994212.

The previous prime is 3994189. The next prime is 3994223. The reversal of 3994213 is 3124993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3992004 + 2209 = 1998^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994213 - 2⁹ = 3993701 is a prime.

3994213 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3994223) 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 as a sum of consecutive naturals, namely, 1997106 + 1997107.

It is an arithmetic number, because the mean of its divisors is an integer number (1997107).

Almost surely, 2^3994213 is an apocalyptic number.

It is an amenable number.

3994213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3994213 is an equidigital number, since it uses as much as digits as its factorization.

3994213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 3994213 is about 1998.5527263497. The cubic root of 3994213 is about 158.6635158340.

It can be divided in two parts, 399421 and 3, that added together give a square (399424 = 632²).

The spelling of 3994213 in words is "three million, nine hundred ninety-four thousand, two hundred thirteen".