206470639 has 2 divisors, whose sum is σ = 206470640. Its totient is φ = 206470638.

The previous prime is 206470637. The next prime is 206470643. The reversal of 206470639 is 936074602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206470639 - 2¹ = 206470637 is a prime.

Together with 206470637, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 206470598 and 206470607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206470637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103235319 + 103235320.

It is an arithmetic number, because the mean of its divisors is an integer number (103235320).

Almost surely, 2^206470639 is an apocalyptic number.

206470639 is a deficient number, since it is larger than the sum of its proper divisors (1).

206470639 is an equidigital number, since it uses as much as digits as its factorization.

206470639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 206470639 is about 14369.0862270362. The cubic root of 206470639 is about 591.0434842313.

The spelling of 206470639 in words is "two hundred six million, four hundred seventy thousand, six hundred thirty-nine".