206404423 has 2 divisors, whose sum is σ = 206404424. Its totient is φ = 206404422.

The previous prime is 206404409. The next prime is 206404427. The reversal of 206404423 is 324404602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206404423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206404427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103202211 + 103202212.

It is an arithmetic number, because the mean of its divisors is an integer number (103202212).

Almost surely, 2^206404423 is an apocalyptic number.

206404423 is a deficient number, since it is larger than the sum of its proper divisors (1).

206404423 is an equidigital number, since it uses as much as digits as its factorization.

206404423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 206404423 is about 14366.7819291587. The cubic root of 206404423 is about 590.9802941008.

The spelling of 206404423 in words is "two hundred six million, four hundred four thousand, four hundred twenty-three".