12840931 has 2 divisors, whose sum is σ = 12840932. Its totient is φ = 12840930.

The previous prime is 12840911. The next prime is 12840943. The reversal of 12840931 is 13904821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12840931 - 2¹⁹ = 12316643 is a prime.

It is a super-2 number, since 2×12840931² = 329779017893522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12840931.

It is not a weakly prime, because it can be changed into another prime (12840911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420465 + 6420466.

It is an arithmetic number, because the mean of its divisors is an integer number (6420466).

Almost surely, 2^12840931 is an apocalyptic number.

12840931 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840931 is an equidigital number, since it uses as much as digits as its factorization.

12840931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 12840931 is about 3583.4244794610. The cubic root of 12840931 is about 234.1704932752.

The spelling of 12840931 in words is "twelve million, eight hundred forty thousand, nine hundred thirty-one".