688403 has 2 divisors, whose sum is σ = 688404. Its totient is φ = 688402.

The previous prime is 688397. The next prime is 688411. The reversal of 688403 is 304886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688403 - 2⁶ = 688339 is a prime.

It is not a weakly prime, because it can be changed into another prime (688423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344201 + 344202.

It is an arithmetic number, because the mean of its divisors is an integer number (344202).

2⁶⁸⁸⁴⁰³ is an apocalyptic number.

688403 is a deficient number, since it is larger than the sum of its proper divisors (1).

688403 is an equidigital number, since it uses as much as digits as its factorization.

688403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 688403 is about 829.7005483908. The cubic root of 688403 is about 88.2973327449.

The spelling of 688403 in words is "six hundred eighty-eight thousand, four hundred three".