12328638 has 64 divisors (see below), whose sum is σ = 30855168. Its totient is φ = 3202560.

The previous prime is 12328637. The next prime is 12328643. The reversal of 12328638 is 83682321.

It is a junction number, because it is equal to n+sod(n) for n = 12328599 and 12328608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12328633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21856 + ... + 22412.

It is an arithmetic number, because the mean of its divisors is an integer number (482112).

Almost surely, 2^12328638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12328638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15427584).

12328638 is an abundant number, since it is smaller than the sum of its proper divisors (18526530).

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

12328638 is a wasteful number, since it uses less digits than its factorization.

12328638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617.

The product of its digits is 13824, while the sum is 33.

The square root of 12328638 is about 3511.2160286715. The cubic root of 12328638 is about 231.0140356158.

It can be divided in two parts, 1232 and 8638, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 12328638 in words is "twelve million, three hundred twenty-eight thousand, six hundred thirty-eight".