668403 has 12 divisors (see below), whose sum is σ = 1007760. Its totient is φ = 426096.

The previous prime is 668347. The next prime is 668407. The reversal of 668403 is 304866.

It is not a de Polignac number, because 668403 - 2¹⁰ = 667379 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (668407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1408 + ... + 1821.

It is an arithmetic number, because the mean of its divisors is an integer number (83980).

2⁶⁶⁸⁴⁰³ is an apocalyptic number.

668403 is a deficient number, since it is larger than the sum of its proper divisors (339357).

668403 is a wasteful number, since it uses less digits than its factorization.

668403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258 (or 3255 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 668403 is about 817.5591721704. The cubic root of 668403 is about 87.4338220698.

The spelling of 668403 in words is "six hundred sixty-eight thousand, four hundred three".