12913605 has 24 divisors (see below), whose sum is σ = 22475232. Its totient is φ = 6859104.

The previous prime is 12913601. The next prime is 12913643. The reversal of 12913605 is 50631921.

It is not a de Polignac number, because 12913605 - 2² = 12913601 is a prime.

It is a super-2 number, since 2×12913605² = 333522388192050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12913601) 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 23 ways as a sum of consecutive naturals, for example, 15202 + ... + 16028.

It is an arithmetic number, because the mean of its divisors is an integer number (936468).

Almost surely, 2^12913605 is an apocalyptic number.

12913605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12913605 is a deficient number, since it is larger than the sum of its proper divisors (9561627).

12913605 is a wasteful number, since it uses less digits than its factorization.

12913605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185 (or 1182 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 12913605 is about 3593.5504727219. The cubic root of 12913605 is about 234.6114296841.

The spelling of 12913605 in words is "twelve million, nine hundred thirteen thousand, six hundred five".