688341839 has 2 divisors, whose sum is σ = 688341840. Its totient is φ = 688341838.

The previous prime is 688341833. The next prime is 688341847. The reversal of 688341839 is 938143886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688341839 - 2⁸ = 688341583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688341833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344170919 + 344170920.

It is an arithmetic number, because the mean of its divisors is an integer number (344170920).

Almost surely, 2^688341839 is an apocalyptic number.

688341839 is a deficient number, since it is larger than the sum of its proper divisors (1).

688341839 is an equidigital number, since it uses as much as digits as its factorization.

688341839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 50.

The square root of 688341839 is about 26236.2695328433. The cubic root of 688341839 is about 882.9471774895.

The spelling of 688341839 in words is "six hundred eighty-eight million, three hundred forty-one thousand, eight hundred thirty-nine".