12131780 has 12 divisors (see below), whose sum is σ = 25476780. Its totient is φ = 4852704.

The previous prime is 12131771. The next prime is 12131789. The reversal of 12131780 is 8713121.

It is a happy number.

12131780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12131771) and next prime (12131789).

It can be written as a sum of positive squares in 2 ways, for example, as 8099716 + 4032064 = 2846^2 + 2008^2 .

It is not an unprimeable number, because it can be changed into a prime (12131789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 303275 + ... + 303314.

It is an arithmetic number, because the mean of its divisors is an integer number (2123065).

Almost surely, 2^12131780 is an apocalyptic number.

12131780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131780 is an abundant number, since it is smaller than the sum of its proper divisors (13345000).

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

12131780 is a wasteful number, since it uses less digits than its factorization.

12131780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606598 (or 606596 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 12131780 is about 3483.0704845007. The cubic root of 12131780 is about 229.7778573490. Note that the first 3 decimals are identical.

The spelling of 12131780 in words is "twelve million, one hundred thirty-one thousand, seven hundred eighty".