12018731 has 12 divisors (see below), whose sum is σ = 12876864. Its totient is φ = 11205600.

The previous prime is 12018703. The next prime is 12018733. The reversal of 12018731 is 13781021.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-12018731 is a prime.

It is a super-2 number, since 2×12018731² = 288899789700722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12018697 and 12018706.

It is not an unprimeable number, because it can be changed into a prime (12018733) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 25841 + ... + 26301.

It is an arithmetic number, because the mean of its divisors is an integer number (1073072).

Almost surely, 2^12018731 is an apocalyptic number.

12018731 is a deficient number, since it is larger than the sum of its proper divisors (858133).

12018731 is an equidigital number, since it uses as much as digits as its factorization.

12018731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550 (or 521 counting only the distinct ones).

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

The square root of 12018731 is about 3466.8041479149. The cubic root of 12018731 is about 229.0619068214.

Adding to 12018731 its reverse (13781021), we get a palindrome (25799752).

The spelling of 12018731 in words is "twelve million, eighteen thousand, seven hundred thirty-one".