12123545 has 16 divisors (see below), whose sum is σ = 16802688. Its totient is φ = 8225280.

The previous prime is 12123523. The next prime is 12123557. The reversal of 12123545 is 54532121.

12123545 = 128² + 129² + ... + 337².

It is not a de Polignac number, because 12123545 - 2⁶ = 12123481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12123545.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1610 + ... + 5180.

It is an arithmetic number, because the mean of its divisors is an integer number (1050168).

Almost surely, 2^12123545 is an apocalyptic number.

It is an amenable number.

12123545 is a deficient number, since it is larger than the sum of its proper divisors (4679143).

12123545 is an equidigital number, since it uses as much as digits as its factorization.

12123545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3680.

The product of its digits is 1200, while the sum is 23.

The square root of 12123545 is about 3481.8881372037. Note that the first 3 decimals coincide. The cubic root of 12123545 is about 229.7258548410.

Adding to 12123545 its reverse (54532121), we get a palindrome (66655666).

The spelling of 12123545 in words is "twelve million, one hundred twenty-three thousand, five hundred forty-five".