12129444 has 18 divisors (see below), whose sum is σ = 30660630. Its totient is φ = 4043136.

The previous prime is 12129419. The next prime is 12129473. The reversal of 12129444 is 44492121.

It is a happy number.

12129444 is a `hidden beast` number, since 1 + 212 + 9 + 444 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12110400 + 19044 = 3480^2 + 138^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 168429 + ... + 168500.

Almost surely, 2^12129444 is an apocalyptic number.

It is an amenable number.

12129444 is an abundant number, since it is smaller than the sum of its proper divisors (18531186).

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

12129444 is a wasteful number, since it uses less digits than its factorization.

12129444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336939 (or 336934 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 12129444 is about 3482.7351320478. The cubic root of 12129444 is about 229.7631083309.

The spelling of 12129444 in words is "twelve million, one hundred twenty-nine thousand, four hundred forty-four".