12139472 has 20 divisors (see below), whose sum is σ = 23574756. Its totient is φ = 6055680.

The previous prime is 12139447. The next prime is 12139483. The reversal of 12139472 is 27493121.

It can be written as a sum of positive squares in 2 ways, for example, as 4096576 + 8042896 = 2024^2 + 2836^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 11678 + ... + 12674.

Almost surely, 2^12139472 is an apocalyptic number.

It is an amenable number.

12139472 is a deficient number, since it is larger than the sum of its proper divisors (11435284).

12139472 is an equidigital number, since it uses as much as digits as its factorization.

12139472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1766 (or 1760 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 12139472 is about 3484.1745076847. The cubic root of 12139472 is about 229.8264096600.

It can be divided in two parts, 121 and 39472, that added together give a palindrome (39593).

The spelling of 12139472 in words is "twelve million, one hundred thirty-nine thousand, four hundred seventy-two".