12129256 has 8 divisors (see below), whose sum is σ = 22742370. Its totient is φ = 6064624.

The previous prime is 12129251. The next prime is 12129259. The reversal of 12129256 is 65292121.

12129256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9205156 + 2924100 = 3034^2 + 1710^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×12129256² = 294237702227072, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12129251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758071 + ... + 758086.

Almost surely, 2^12129256 is an apocalyptic number.

It is an amenable number.

12129256 is a deficient number, since it is larger than the sum of its proper divisors (10613114).

12129256 is a wasteful number, since it uses less digits than its factorization.

12129256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1516163 (or 1516159 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 12129256 is about 3482.7081416622. The cubic root of 12129256 is about 229.7619212556.

The spelling of 12129256 in words is "twelve million, one hundred twenty-nine thousand, two hundred fifty-six".