423638 has 8 divisors (see below), whose sum is σ = 639360. Its totient is φ = 210520.

The previous prime is 423617. The next prime is 423649. The reversal of 423638 is 836324.

423638 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.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

423638 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, 173 + ... + 936.

It is an arithmetic number, because the mean of its divisors is an integer number (79920).

2⁴²³⁶³⁸ is an apocalyptic number.

423638 is a deficient number, since it is larger than the sum of its proper divisors (215722).

423638 is a wasteful number, since it uses less digits than its factorization.

423638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302.

The product of its digits is 3456, while the sum is 26.

The square root of 423638 is about 650.8747959477. The cubic root of 423638 is about 75.1043288799.

Subtracting 423638 from its reverse (836324), we obtain a triangular number (412686 = T₉₀₈).

The spelling of 423638 in words is "four hundred twenty-three thousand, six hundred thirty-eight".