12940649 has 2 divisors, whose sum is σ = 12940650. Its totient is φ = 12940648.

The previous prime is 12940643. The next prime is 12940661. The reversal of 12940649 is 94604921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12201049 + 739600 = 3493^2 + 860^2 .

It is an emirp because it is prime and its reverse (94604921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12940649 - 2⁸ = 12940393 is a prime.

It is equal to p₈₄₅₆₃₉ and since 12940649 and 845639 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (12940643) 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, 6470324 + 6470325.

It is an arithmetic number, because the mean of its divisors is an integer number (6470325).

Almost surely, 2^12940649 is an apocalyptic number.

It is an amenable number.

12940649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12940649 is an equidigital number, since it uses as much as digits as its factorization.

12940649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 12940649 is about 3597.3113571110. The cubic root of 12940649 is about 234.7750918962.

The spelling of 12940649 in words is "twelve million, nine hundred forty thousand, six hundred forty-nine".