403668 has 18 divisors (see below), whose sum is σ = 1020474. Its totient is φ = 134544.

The previous prime is 403661. The next prime is 403679. The reversal of 403668 is 866304.

403668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 242064 + 161604 = 492^2 + 402^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 403668.

It is not an unprimeable number, because it can be changed into a prime (403661) by changing a digit.

403668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5571 + ... + 5642.

It is an arithmetic number, because the mean of its divisors is an integer number (56693).

2⁴⁰³⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

403668 is an abundant number, since it is smaller than the sum of its proper divisors (616806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

403668 is a wasteful number, since it uses less digits than its factorization.

403668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11223 (or 11218 counting only the distinct ones).

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

The square root of 403668 is about 635.3487231434. The cubic root of 403668 is about 73.9051621705.

The spelling of 403668 in words is "four hundred three thousand, six hundred sixty-eight".