12031816 has 16 divisors (see below), whose sum is σ = 22604400. Its totient is φ = 6003984.

The previous prime is 12031777. The next prime is 12031837. The reversal of 12031816 is 61813021.

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 3 ways as a sum of consecutive naturals, for example, 3975 + ... + 6313.

It is an arithmetic number, because the mean of its divisors is an integer number (1412775).

Almost surely, 2^12031816 is an apocalyptic number.

It is an amenable number.

12031816 is a deficient number, since it is larger than the sum of its proper divisors (10572584).

12031816 is a wasteful number, since it uses less digits than its factorization.

12031816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2988 (or 2984 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 12031816 is about 3468.6908193150. The cubic root of 12031816 is about 229.1450045567.

Adding to 12031816 its reverse (61813021), we get a palindrome (73844837).

The spelling of 12031816 in words is "twelve million, thirty-one thousand, eight hundred sixteen".