12123765 has 24 divisors (see below), whose sum is σ = 21097440. Its totient is φ = 6440544.

The previous prime is 12123763. The next prime is 12123773. The reversal of 12123765 is 56732121.

It is a happy number.

12123765 is nontrivially palindromic in base 8.

12123765 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12123765 - 2¹ = 12123763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18534 + ... + 19176.

It is an arithmetic number, because the mean of its divisors is an integer number (879060).

Almost surely, 2^12123765 is an apocalyptic number.

12123765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12123765 is a deficient number, since it is larger than the sum of its proper divisors (8973675).

12123765 is a wasteful number, since it uses less digits than its factorization.

12123765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073 (or 1070 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 12123765 is about 3481.9197291150. The cubic root of 12123765 is about 229.7272444065.

Adding to 12123765 its reverse (56732121), we get a palindrome (68855886).

The spelling of 12123765 in words is "twelve million, one hundred twenty-three thousand, seven hundred sixty-five".