12123665 has 8 divisors (see below), whose sum is σ = 14596200. Its totient is φ = 9667072.

The previous prime is 12123649. The next prime is 12123673. The reversal of 12123665 is 56632121.

It can be written as a sum of positive squares in 4 ways, for example, as 678976 + 11444689 = 824^2 + 3383^2 .

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 12123665 - 2⁴ = 12123649 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2240 + ... + 5409.

It is an arithmetic number, because the mean of its divisors is an integer number (1824525).

Almost surely, 2^12123665 is an apocalyptic number.

It is an amenable number.

12123665 is a deficient number, since it is larger than the sum of its proper divisors (2472535).

12123665 is an equidigital number, since it uses as much as digits as its factorization.

12123665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7971.

The product of its digits is 2160, while the sum is 26.

The square root of 12123665 is about 3481.9053691908. The cubic root of 12123665 is about 229.7266127879.

Adding to 12123665 its reverse (56632121), we get a palindrome (68755786).

The spelling of 12123665 in words is "twelve million, one hundred twenty-three thousand, six hundred sixty-five".