12128997 has 8 divisors (see below), whose sum is σ = 16477344. Its totient is φ = 7933328.

The previous prime is 12128969. The next prime is 12129017. The reversal of 12128997 is 79982121.

12128997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12128997 - 2⁷ = 12128869 is a prime.

It is a super-2 number, since 2×12128997² = 294225136452018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37983 + ... + 38300.

It is an arithmetic number, because the mean of its divisors is an integer number (2059668).

Almost surely, 2^12128997 is an apocalyptic number.

It is an amenable number.

12128997 is a deficient number, since it is larger than the sum of its proper divisors (4348347).

12128997 is an equidigital number, since it uses as much as digits as its factorization.

12128997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76339.

The product of its digits is 18144, while the sum is 39.

The square root of 12128997 is about 3482.6709577564. The cubic root of 12128997 is about 229.7602858500.

The spelling of 12128997 in words is "twelve million, one hundred twenty-eight thousand, nine hundred ninety-seven".