12905615 has 4 divisors (see below), whose sum is σ = 15486744. Its totient is φ = 10324488.

The previous prime is 12905603. The next prime is 12905639. The reversal of 12905615 is 51650921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12905615 - 2¹² = 12901519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1290557 + ... + 1290566.

It is an arithmetic number, because the mean of its divisors is an integer number (3871686).

Almost surely, 2^12905615 is an apocalyptic number.

12905615 is a deficient number, since it is larger than the sum of its proper divisors (2581129).

12905615 is an equidigital number, since it uses as much as digits as its factorization.

12905615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581128.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 12905615 is about 3592.4385868098. The cubic root of 12905615 is about 234.5630328688.

The spelling of 12905615 in words is "twelve million, nine hundred five thousand, six hundred fifteen".