12131478 has 32 divisors (see below), whose sum is σ = 27832320. Its totient is φ = 3912840.

The previous prime is 12131473. The next prime is 12131507. The reversal of 12131478 is 87413121.

12131478 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 Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1950 + ... + 5297.

It is an arithmetic number, because the mean of its divisors is an integer number (869760).

Almost surely, 2^12131478 is an apocalyptic number.

12131478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12131478 is an abundant number, since it is smaller than the sum of its proper divisors (15700842).

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

12131478 is a wasteful number, since it uses less digits than its factorization.

12131478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7289 (or 7283 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 12131478 is about 3483.0271316773. The cubic root of 12131478 is about 229.7759506904.

Adding to 12131478 its reverse (87413121), we get a palindrome (99544599).

The spelling of 12131478 in words is "twelve million, one hundred thirty-one thousand, four hundred seventy-eight".