12809457 has 6 divisors (see below), whose sum is σ = 18502562. Its totient is φ = 8539632.

The previous prime is 12809359. The next prime is 12809491. The reversal of 12809457 is 75490821.

It can be written as a sum of positive squares in only one way, i.e., 12278016 + 531441 = 3504^2 + 729^2 .

It is not a de Polignac number, because 12809457 - 2²³ = 4420849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12809497) 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 5 ways as a sum of consecutive naturals, for example, 711628 + ... + 711645.

Almost surely, 2^12809457 is an apocalyptic number.

It is an amenable number.

12809457 is a deficient number, since it is larger than the sum of its proper divisors (5693105).

12809457 is a wasteful number, since it uses less digits than its factorization.

12809457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423279 (or 1423276 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 12809457 is about 3579.0301758996. The cubic root of 12809457 is about 233.9790141162.

The spelling of 12809457 in words is "twelve million, eight hundred nine thousand, four hundred fifty-seven".