12139904 has 64 divisors (see below), whose sum is σ = 29302560. Its totient is φ = 4890624.

The previous prime is 12139891. The next prime is 12139913. The reversal of 12139904 is 40993121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14834 + ... + 15630.

Almost surely, 2^12139904 is an apocalyptic number.

12139904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12139904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14651280).

12139904 is an abundant number, since it is smaller than the sum of its proper divisors (17162656).

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

12139904 is an equidigital number, since it uses as much as digits as its factorization.

12139904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 12139904 is about 3484.2365017318. The cubic root of 12139904 is about 229.8291358585.

The spelling of 12139904 in words is "twelve million, one hundred thirty-nine thousand, nine hundred four".