12138984 has 160 divisors (see below), whose sum is σ = 40249440. Its totient is φ = 3369600.

The previous prime is 12138983. The next prime is 12139007. The reversal of 12138984 is 48983121.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (12138983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 92599 + ... + 92729.

It is an arithmetic number, because the mean of its divisors is an integer number (251559).

Almost surely, 2^12138984 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 12138984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20124720).

12138984 is an abundant number, since it is smaller than the sum of its proper divisors (28110456).

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

12138984 is a wasteful number, since it uses less digits than its factorization.

12138984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 160 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 12138984 is about 3484.1044760455. The cubic root of 12138984 is about 229.8233299876.

The spelling of 12138984 in words is "twelve million, one hundred thirty-eight thousand, nine hundred eighty-four".