12129536 has 18 divisors (see below), whose sum is σ = 24212202. Its totient is φ = 6064640.

The previous prime is 12129521. The next prime is 12129539. The reversal of 12129536 is 63592121.

It can be written as a sum of positive squares in only one way, i.e., 11833600 + 295936 = 3440^2 + 544^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12129499 and 12129508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23435 + ... + 23946.

Almost surely, 2^12129536 is an apocalyptic number.

12129536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12129536 is a deficient number, since it is larger than the sum of its proper divisors (12082666).

12129536 is an frugal number, since it uses more digits than its factorization.

12129536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47397 (or 47383 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 12129536 is about 3482.7483400326. The cubic root of 12129536 is about 229.7636892355.

The spelling of 12129536 in words is "twelve million, one hundred twenty-nine thousand, five hundred thirty-six".