685702379 has 2 divisors, whose sum is σ = 685702380. Its totient is φ = 685702378.

The previous prime is 685702373. The next prime is 685702397. The reversal of 685702379 is 973207586.

Together with next prime (685702397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685702379 - 2¹² = 685698283 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (685702373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342851189 + 342851190.

It is an arithmetic number, because the mean of its divisors is an integer number (342851190).

Almost surely, 2^685702379 is an apocalyptic number.

685702379 is a deficient number, since it is larger than the sum of its proper divisors (1).

685702379 is an equidigital number, since it uses as much as digits as its factorization.

685702379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 685702379 is about 26185.9194797509. The cubic root of 685702379 is about 881.8171726121.

The spelling of 685702379 in words is "six hundred eighty-five million, seven hundred two thousand, three hundred seventy-nine".