685956407 has 4 divisors (see below), whose sum is σ = 697201656. Its totient is φ = 674711160.

The previous prime is 685956379. The next prime is 685956421. The reversal of 685956407 is 704659586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 685956407 - 2²⁸ = 417520951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685956457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5622533 + ... + 5622654.

It is an arithmetic number, because the mean of its divisors is an integer number (174300414).

Almost surely, 2^685956407 is an apocalyptic number.

685956407 is a deficient number, since it is larger than the sum of its proper divisors (11245249).

685956407 is a wasteful number, since it uses less digits than its factorization.

685956407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11245248.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 685956407 is about 26190.7694999593. The cubic root of 685956407 is about 881.9260529870.

The spelling of 685956407 in words is "six hundred eighty-five million, nine hundred fifty-six thousand, four hundred seven".