12840473 has 2 divisors, whose sum is σ = 12840474. Its totient is φ = 12840472.

The previous prime is 12840461. The next prime is 12840493. The reversal of 12840473 is 37404821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10061584 + 2778889 = 3172^2 + 1667^2 .

It is an emirp because it is prime and its reverse (37404821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12840473 is a prime.

It is not a weakly prime, because it can be changed into another prime (12840493) 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 as a sum of consecutive naturals, namely, 6420236 + 6420237.

It is an arithmetic number, because the mean of its divisors is an integer number (6420237).

Almost surely, 2^12840473 is an apocalyptic number.

It is an amenable number.

12840473 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840473 is an equidigital number, since it uses as much as digits as its factorization.

12840473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 12840473 is about 3583.3605735399. The cubic root of 12840473 is about 234.1677091739.

The spelling of 12840473 in words is "twelve million, eight hundred forty thousand, four hundred seventy-three".