12138822 has 24 divisors (see below), whose sum is σ = 27275976. Its totient is φ = 4046112.

The previous prime is 12138821. The next prime is 12138827. The reversal of 12138822 is 22883121.

12138822 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12003 + ... + 12974.

It is an arithmetic number, because the mean of its divisors is an integer number (1136499).

Almost surely, 2^12138822 is an apocalyptic number.

12138822 is an abundant number, since it is smaller than the sum of its proper divisors (15137154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12138822 is an equidigital number, since it uses as much as digits as its factorization.

12138822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24994 (or 24982 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 12138822 is about 3484.0812275261. The cubic root of 12138822 is about 229.8223076191.

The spelling of 12138822 in words is "twelve million, one hundred thirty-eight thousand, eight hundred twenty-two".