12131378 has 16 divisors (see below), whose sum is σ = 20891520. Its totient is φ = 5175456.

The previous prime is 12131377. The next prime is 12131389. The reversal of 12131378 is 87313121.

It is not an unprimeable number, because it can be changed into a prime (12131377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1403 + ... + 5121.

It is an arithmetic number, because the mean of its divisors is an integer number (1305720).

Almost surely, 2^12131378 is an apocalyptic number.

12131378 is a deficient number, since it is larger than the sum of its proper divisors (8760142).

12131378 is a wasteful number, since it uses less digits than its factorization.

12131378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961.

The product of its digits is 1008, while the sum is 26.

The square root of 12131378 is about 3483.0127763188. The cubic root of 12131378 is about 229.7753193395.

Adding to 12131378 its reverse (87313121), we get a palindrome (99444499).

The spelling of 12131378 in words is "twelve million, one hundred thirty-one thousand, three hundred seventy-eight".