12131388 has 18 divisors (see below), whose sum is σ = 30665544. Its totient is φ = 4043784.

The previous prime is 12131377. The next prime is 12131389. The reversal of 12131388 is 88313121.

12131388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 168456 + ... + 168527.

Almost surely, 2^12131388 is an apocalyptic number.

12131388 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12131388 is an abundant number, since it is smaller than the sum of its proper divisors (18534156).

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

12131388 is a wasteful number, since it uses less digits than its factorization.

12131388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336993 (or 336988 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 12131388 is about 3483.0142118573. The cubic root of 12131388 is about 229.7753824747.

It can be divided in two parts, 1213 and 1388, that added together give a square (2601 = 51²).

The spelling of 12131388 in words is "twelve million, one hundred thirty-one thousand, three hundred eighty-eight".