204213839 has 2 divisors, whose sum is σ = 204213840. Its totient is φ = 204213838.

The previous prime is 204213829. The next prime is 204213869. The reversal of 204213839 is 938312402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204213839 is a prime.

It is equal to p_11299316 and since 204213839 and 11299316 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204213829) 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, 102106919 + 102106920.

It is an arithmetic number, because the mean of its divisors is an integer number (102106920).

Almost surely, 2^204213839 is an apocalyptic number.

204213839 is a deficient number, since it is larger than the sum of its proper divisors (1).

204213839 is an equidigital number, since it uses as much as digits as its factorization.

204213839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 204213839 is about 14290.3407587083. The cubic root of 204213839 is about 588.8821494040.

The spelling of 204213839 in words is "two hundred four million, two hundred thirteen thousand, eight hundred thirty-nine".