688379 has 2 divisors, whose sum is σ = 688380. Its totient is φ = 688378.

The previous prime is 688357. The next prime is 688393. The reversal of 688379 is 973886.

688379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (688309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344189 + 344190.

It is an arithmetic number, because the mean of its divisors is an integer number (344190).

2⁶⁸⁸³⁷⁹ is an apocalyptic number.

688379 is a deficient number, since it is larger than the sum of its proper divisors (1).

688379 is an equidigital number, since it uses as much as digits as its factorization.

688379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 688379 is about 829.6860852154. The cubic root of 688379 is about 88.2963066208.

The spelling of 688379 in words is "six hundred eighty-eight thousand, three hundred seventy-nine".