403644 has 12 divisors (see below), whose sum is σ = 941864. Its totient is φ = 134544.

The previous prime is 403621. The next prime is 403649. The reversal of 403644 is 446304.

403644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 403644.

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 403644.

It is not an unprimeable number, because it can be changed into a prime (403649) by changing a digit.

403644 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 3 ways as a sum of consecutive naturals, for example, 16807 + ... + 16830.

2⁴⁰³⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

403644 is an abundant number, since it is smaller than the sum of its proper divisors (538220).

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

403644 is a wasteful number, since it uses less digits than its factorization.

403644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33644 (or 33642 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 403644 is about 635.3298355972. The cubic root of 403644 is about 73.9036974693.

Adding to 403644 its reverse (446304), we get a palindrome (849948).

The spelling of 403644 in words is "four hundred three thousand, six hundred forty-four".