204328639 has 2 divisors, whose sum is σ = 204328640. Its totient is φ = 204328638.

The previous prime is 204328613. The next prime is 204328643. The reversal of 204328639 is 936823402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204328639 - 2⁹ = 204328127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204328598 and 204328607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204328609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102164319 + 102164320.

It is an arithmetic number, because the mean of its divisors is an integer number (102164320).

Almost surely, 2^204328639 is an apocalyptic number.

204328639 is a deficient number, since it is larger than the sum of its proper divisors (1).

204328639 is an equidigital number, since it uses as much as digits as its factorization.

204328639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 204328639 is about 14294.3568935437. The cubic root of 204328639 is about 588.9924765773.

The spelling of 204328639 in words is "two hundred four million, three hundred twenty-eight thousand, six hundred thirty-nine".