12212378 has 4 divisors (see below), whose sum is σ = 18318570. Its totient is φ = 6106188.

The previous prime is 12212377. The next prime is 12212399. The reversal of 12212378 is 87321221.

12212378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 7856809 + 4355569 = 2803^2 + 2087^2 .

It is not an unprimeable number, because it can be changed into a prime (12212377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3053093 + ... + 3053096.

Almost surely, 2^12212378 is an apocalyptic number.

12212378 is a deficient number, since it is larger than the sum of its proper divisors (6106192).

12212378 is an equidigital number, since it uses as much as digits as its factorization.

12212378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6106191.

The product of its digits is 1344, while the sum is 26.

The square root of 12212378 is about 3494.6212956485. The cubic root of 12212378 is about 230.2855809875.

Adding to 12212378 its reverse (87321221), we get a palindrome (99533599).

The spelling of 12212378 in words is "twelve million, two hundred twelve thousand, three hundred seventy-eight".