12129797 has 4 divisors (see below), whose sum is σ = 12249996. Its totient is φ = 12009600.

The previous prime is 12129781. The next prime is 12129811. The reversal of 12129797 is 79792121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79792121 = 101 ⋅790021.

It can be written as a sum of positive squares in 2 ways, for example, as 6220036 + 5909761 = 2494^2 + 2431^2 .

It is a cyclic number.

It is not a de Polignac number, because 12129797 - 2⁴ = 12129781 is a prime.

It is a super-2 number, since 2×12129797² = 294263950522418, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12129797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59948 + ... + 60149.

It is an arithmetic number, because the mean of its divisors is an integer number (3062499).

Almost surely, 2^12129797 is an apocalyptic number.

It is an amenable number.

12129797 is a deficient number, since it is larger than the sum of its proper divisors (120199).

12129797 is a wasteful number, since it uses less digits than its factorization.

12129797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120198.

The product of its digits is 15876, while the sum is 38.

The square root of 12129797 is about 3482.7858102387. The cubic root of 12129797 is about 229.7653372209.

The spelling of 12129797 in words is "twelve million, one hundred twenty-nine thousand, seven hundred ninety-seven".