12389784 has 64 divisors (see below), whose sum is σ = 34318080. Its totient is φ = 3696000.

The previous prime is 12389761. The next prime is 12389789. The reversal of 12389784 is 48798321.

12389784 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12389789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18414 + ... + 19074.

It is an arithmetic number, because the mean of its divisors is an integer number (536220).

Almost surely, 2^12389784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12389784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17159040).

12389784 is an abundant number, since it is smaller than the sum of its proper divisors (21928296).

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

12389784 is a wasteful number, since it uses less digits than its factorization.

12389784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752 (or 748 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 12389784 is about 3519.9124989124. The cubic root of 12389784 is about 231.3953238976.

The spelling of 12389784 in words is "twelve million, three hundred eighty-nine thousand, seven hundred eighty-four".