12129623 has 4 divisors (see below), whose sum is σ = 13232328. Its totient is φ = 11026920.

The previous prime is 12129617. The next prime is 12129659. The reversal of 12129623 is 32692121.

12129623 = 732² + 733² + ... + 753².

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12129623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12129592 and 12129601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122623) by changing a digit.

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, 551336 + ... + 551357.

It is an arithmetic number, because the mean of its divisors is an integer number (3308082).

Almost surely, 2^12129623 is an apocalyptic number.

12129623 is a deficient number, since it is larger than the sum of its proper divisors (1102705).

12129623 is a wasteful number, since it uses less digits than its factorization.

12129623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102704.

The product of its digits is 1296, while the sum is 26.

The square root of 12129623 is about 3482.7608301461. The cubic root of 12129623 is about 229.7642385666.

The spelling of 12129623 in words is "twelve million, one hundred twenty-nine thousand, six hundred twenty-three".