12129457 has 4 divisors (see below), whose sum is σ = 12139120. Its totient is φ = 12119796.

The previous prime is 12129419. The next prime is 12129473. The reversal of 12129457 is 75492121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12129457 is a prime.

It is a super-2 number, since 2×12129457² = 294247454229698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12129407) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2607 + ... + 5572.

It is an arithmetic number, because the mean of its divisors is an integer number (3034780).

Almost surely, 2^12129457 is an apocalyptic number.

It is an amenable number.

12129457 is a deficient number, since it is larger than the sum of its proper divisors (9663).

12129457 is an equidigital number, since it uses as much as digits as its factorization.

12129457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9662.

The product of its digits is 5040, while the sum is 31.

The square root of 12129457 is about 3482.7369983965. The cubic root of 12129457 is about 229.7631904154.

The spelling of 12129457 in words is "twelve million, one hundred twenty-nine thousand, four hundred fifty-seven".