12643825 has 12 divisors (see below), whose sum is σ = 16103260. Its totient is φ = 9840960.

The previous prime is 12643823. The next prime is 12643837. The reversal of 12643825 is 52834621.

It can be written as a sum of positive squares in 6 ways, for example, as 595984 + 12047841 = 772^2 + 3471^2 .

It is not a de Polignac number, because 12643825 - 2¹ = 12643823 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12643823) 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 11 ways as a sum of consecutive naturals, for example, 5910 + ... + 7759.

Almost surely, 2^12643825 is an apocalyptic number.

It is an amenable number.

12643825 is a deficient number, since it is larger than the sum of its proper divisors (3459435).

12643825 is a wasteful number, since it uses less digits than its factorization.

12643825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13716 (or 13711 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 12643825 is about 3555.8156588890. The cubic root of 12643825 is about 232.9661515174.

The spelling of 12643825 in words is "twelve million, six hundred forty-three thousand, eight hundred twenty-five".