12031320 has 64 divisors (see below), whose sum is σ = 41253120. Its totient is φ = 2749824.

The previous prime is 12031319. The next prime is 12031337. The reversal of 12031320 is 2313021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12031296 and 12031305.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6322 + ... + 8001.

It is an arithmetic number, because the mean of its divisors is an integer number (644580).

Almost surely, 2^12031320 is an apocalyptic number.

12031320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12031320 is an abundant number, since it is smaller than the sum of its proper divisors (29221800).

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

12031320 is a wasteful number, since it uses less digits than its factorization.

12031320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14344 (or 14340 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 12031320 is about 3468.6193218628. The cubic root of 12031320 is about 229.1418557529.

Adding to 12031320 its reverse (2313021), we get a palindrome (14344341).

The spelling of 12031320 in words is "twelve million, thirty-one thousand, three hundred twenty".