12345506 has 4 divisors (see below), whose sum is σ = 18518262. Its totient is φ = 6172752.

The previous prime is 12345499. The next prime is 12345511. The reversal of 12345506 is 60554321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60554321 = 269 ⋅225109.

It can be written as a sum of positive squares in only one way, i.e., 11868025 + 477481 = 3445^2 + 691^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3086375 + ... + 3086378.

Almost surely, 2^12345506 is an apocalyptic number.

12345506 is a deficient number, since it is larger than the sum of its proper divisors (6172756).

12345506 is an equidigital number, since it uses as much as digits as its factorization.

12345506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6172755.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 12345506 is about 3513.6172244569. The cubic root of 12345506 is about 231.1193451380.

Adding to 12345506 its reverse (60554321), we get a palindrome (72899827).

The spelling of 12345506 in words is "twelve million, three hundred forty-five thousand, five hundred six".