206438447 has 2 divisors, whose sum is σ = 206438448. Its totient is φ = 206438446.

The previous prime is 206438389. The next prime is 206438461. The reversal of 206438447 is 744834602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206438447 - 2²² = 202244143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206438447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206438047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103219223 + 103219224.

It is an arithmetic number, because the mean of its divisors is an integer number (103219224).

Almost surely, 2^206438447 is an apocalyptic number.

206438447 is a deficient number, since it is larger than the sum of its proper divisors (1).

206438447 is an equidigital number, since it uses as much as digits as its factorization.

206438447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 38.

The square root of 206438447 is about 14367.9660007950. The cubic root of 206438447 is about 591.0127649954.

The spelling of 206438447 in words is "two hundred six million, four hundred thirty-eight thousand, four hundred forty-seven".