12840031 has 2 divisors, whose sum is σ = 12840032. Its totient is φ = 12840030.

The previous prime is 12840019. The next prime is 12840089. The reversal of 12840031 is 13004821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12840031 - 2⁷ = 12839903 is a prime.

It is a super-2 number, since 2×12840031² = 329732792161922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12839990 and 12840008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12840001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420015 + 6420016.

It is an arithmetic number, because the mean of its divisors is an integer number (6420016).

Almost surely, 2^12840031 is an apocalyptic number.

12840031 is the 1603-rd centered decagonal number.

12840031 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840031 is an equidigital number, since it uses as much as digits as its factorization.

12840031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 12840031 is about 3583.2988990594. The cubic root of 12840031 is about 234.1650222709.

Adding to 12840031 its reverse (13004821), we get a palindrome (25844852).

The spelling of 12840031 in words is "twelve million, eight hundred forty thousand, thirty-one".