12640941 has 10 divisors (see below), whose sum is σ = 18883502. Its totient is φ = 8427240.

The previous prime is 12640931. The next prime is 12640951. The reversal of 12640941 is 14904621.

12640941 is a `hidden beast` number, since 12 + 640 + 9 + 4 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (12640931) and next prime (12640951).

It can be written as a sum of positive squares in only one way, i.e., 12638025 + 2916 = 3555^2 + 54^2 .

It is not a de Polignac number, because 12640941 - 2⁹ = 12640429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 77950 + ... + 78111.

Almost surely, 2^12640941 is an apocalyptic number.

It is an amenable number.

12640941 is a deficient number, since it is larger than the sum of its proper divisors (6242561).

12640941 is an equidigital number, since it uses as much as digits as its factorization.

12640941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156073 (or 156064 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 12640941 is about 3555.4101029276. The cubic root of 12640941 is about 232.9484373243.

The spelling of 12640941 in words is "twelve million, six hundred forty thousand, nine hundred forty-one".