213646439 has 2 divisors, whose sum is σ = 213646440. Its totient is φ = 213646438.

The previous prime is 213646421. The next prime is 213646441. The reversal of 213646439 is 934646312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213646439 - 2¹² = 213642343 is a prime.

Together with 213646441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213640439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106823219 + 106823220.

It is an arithmetic number, because the mean of its divisors is an integer number (106823220).

Almost surely, 2^213646439 is an apocalyptic number.

213646439 is a deficient number, since it is larger than the sum of its proper divisors (1).

213646439 is an equidigital number, since it uses as much as digits as its factorization.

213646439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 38.

The square root of 213646439 is about 14616.6493766526. The cubic root of 213646439 is about 597.8128135657.

The spelling of 213646439 in words is "two hundred thirteen million, six hundred forty-six thousand, four hundred thirty-nine".