12123566 has 32 divisors (see below), whose sum is σ = 23163840. Its totient is φ = 4628736.

The previous prime is 12123563. The next prime is 12123569. The reversal of 12123566 is 66532121.

It is an interprime number because it is at equal distance from previous prime (12123563) and next prime (12123569).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4130 + ... + 6426.

It is an arithmetic number, because the mean of its divisors is an integer number (723870).

Almost surely, 2^12123566 is an apocalyptic number.

12123566 is a deficient number, since it is larger than the sum of its proper divisors (11040274).

12123566 is a wasteful number, since it uses less digits than its factorization.

12123566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348.

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

The square root of 12123566 is about 3481.8911528076. The cubic root of 12123566 is about 229.7259874820.

Adding to 12123566 its reverse (66532121), we get a palindrome (78655687).

The spelling of 12123566 in words is "twelve million, one hundred twenty-three thousand, five hundred sixty-six".