12135806 has 4 divisors (see below), whose sum is σ = 18203712. Its totient is φ = 6067902.

The previous prime is 12135803. The next prime is 12135821. The reversal of 12135806 is 60853121.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3033950 + ... + 3033953.

It is an arithmetic number, because the mean of its divisors is an integer number (4550928).

Almost surely, 2^12135806 is an apocalyptic number.

12135806 is a deficient number, since it is larger than the sum of its proper divisors (6067906).

12135806 is an equidigital number, since it uses as much as digits as its factorization.

12135806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6067905.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 12135806 is about 3483.6483749081. The cubic root of 12135806 is about 229.8032722329.

Adding to 12135806 its reverse (60853121), we get a palindrome (72988927).

The spelling of 12135806 in words is "twelve million, one hundred thirty-five thousand, eight hundred six".