12642905 has 16 divisors (see below), whose sum is σ = 16619904. Its totient is φ = 9156480.

The previous prime is 12642901. The next prime is 12642907. The reversal of 12642905 is 50924621.

It is a happy number.

It is not a de Polignac number, because 12642905 - 2² = 12642901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12642901) 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 15 ways as a sum of consecutive naturals, for example, 24884 + ... + 25386.

It is an arithmetic number, because the mean of its divisors is an integer number (1038744).

Almost surely, 2^12642905 is an apocalyptic number.

It is an amenable number.

12642905 is a deficient number, since it is larger than the sum of its proper divisors (3976999).

12642905 is a wasteful number, since it uses less digits than its factorization.

12642905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 12642905 is about 3555.6862909992. The cubic root of 12642905 is about 232.9605009578.

The spelling of 12642905 in words is "twelve million, six hundred forty-two thousand, nine hundred five".