12809641 has 8 divisors (see below), whose sum is σ = 13857480. Its totient is φ = 11770752.

The previous prime is 12809633. The next prime is 12809647. The reversal of 12809641 is 14690821.

It is a happy number.

12809641 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1946025 + 10863616 = 1395^2 + 3296^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12809641 - 2³ = 12809633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12809647) 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 in 7 ways as a sum of consecutive naturals, for example, 915 + ... + 5143.

It is an arithmetic number, because the mean of its divisors is an integer number (1732185).

Almost surely, 2^12809641 is an apocalyptic number.

It is an amenable number.

12809641 is a deficient number, since it is larger than the sum of its proper divisors (1047839).

12809641 is a wasteful number, since it uses less digits than its factorization.

12809641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 12809641 is about 3579.0558810949. The cubic root of 12809641 is about 233.9801344326.

The spelling of 12809641 in words is "twelve million, eight hundred nine thousand, six hundred forty-one".