685391982 has 32 divisors (see below), whose sum is σ = 1497913344. Its totient is φ = 207345600.

The previous prime is 685391947. The next prime is 685391983. The reversal of 685391982 is 289193586.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685391983) 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 in 15 ways as a sum of consecutive naturals, for example, 32307 + ... + 49137.

It is an arithmetic number, because the mean of its divisors is an integer number (46809792).

Almost surely, 2^685391982 is an apocalyptic number.

685391982 is an abundant number, since it is smaller than the sum of its proper divisors (812521362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685391982 is a wasteful number, since it uses less digits than its factorization.

685391982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17464.

The product of its digits is 933120, while the sum is 51.

The square root of 685391982 is about 26179.9920168055. The cubic root of 685391982 is about 881.6840950922.

The spelling of 685391982 in words is "six hundred eighty-five million, three hundred ninety-one thousand, nine hundred eighty-two".