685240207 has 2 divisors, whose sum is σ = 685240208. Its totient is φ = 685240206.

The previous prime is 685240201. The next prime is 685240223. The reversal of 685240207 is 702042586.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685240207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685240201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342620103 + 342620104.

It is an arithmetic number, because the mean of its divisors is an integer number (342620104).

Almost surely, 2^685240207 is an apocalyptic number.

685240207 is a deficient number, since it is larger than the sum of its proper divisors (1).

685240207 is an equidigital number, since it uses as much as digits as its factorization.

685240207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 685240207 is about 26177.0931732307. The cubic root of 685240207 is about 881.6190094741.

The spelling of 685240207 in words is "six hundred eighty-five million, two hundred forty thousand, two hundred seven".