204657389 has 2 divisors, whose sum is σ = 204657390. Its totient is φ = 204657388.

The previous prime is 204657353. The next prime is 204657391. The reversal of 204657389 is 983756402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147428164 + 57229225 = 12142^2 + 7565^2 .

It is a cyclic number.

It is not a de Polignac number, because 204657389 - 2¹⁶ = 204591853 is a prime.

It is a Sophie Germain prime.

Together with 204657391, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204657589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102328694 + 102328695.

It is an arithmetic number, because the mean of its divisors is an integer number (102328695).

Almost surely, 2^204657389 is an apocalyptic number.

It is an amenable number.

204657389 is a deficient number, since it is larger than the sum of its proper divisors (1).

204657389 is an equidigital number, since it uses as much as digits as its factorization.

204657389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 204657389 is about 14305.8515650065. The cubic root of 204657389 is about 589.3081894147.

The spelling of 204657389 in words is "two hundred four million, six hundred fifty-seven thousand, three hundred eighty-nine".