688940207 has 2 divisors, whose sum is σ = 688940208. Its totient is φ = 688940206.

The previous prime is 688940177. The next prime is 688940243. The reversal of 688940207 is 702049886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688940207 - 2⁶ = 688940143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688945207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344470103 + 344470104.

It is an arithmetic number, because the mean of its divisors is an integer number (344470104).

Almost surely, 2^688940207 is an apocalyptic number.

688940207 is a deficient number, since it is larger than the sum of its proper divisors (1).

688940207 is an equidigital number, since it uses as much as digits as its factorization.

688940207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 688940207 is about 26247.6705061611. The cubic root of 688940207 is about 883.2029488185.

The spelling of 688940207 in words is "six hundred eighty-eight million, nine hundred forty thousand, two hundred seven".