403638 has 8 divisors (see below), whose sum is σ = 807288. Its totient is φ = 134544.

The previous prime is 403621. The next prime is 403649. The reversal of 403638 is 836304.

403638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

403638 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33631 + ... + 33642.

It is an arithmetic number, because the mean of its divisors is an integer number (100911).

2⁴⁰³⁶³⁸ is an apocalyptic number.

403638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

403638 is a wasteful number, since it uses less digits than its factorization.

403638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67278.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 403638 is about 635.3251136229. The cubic root of 403638 is about 73.9033312849.

The spelling of 403638 in words is "four hundred three thousand, six hundred thirty-eight".