12890605 has 32 divisors (see below), whose sum is σ = 19531008. Its totient is φ = 7948800.

The previous prime is 12890597. The next prime is 12890609. The reversal of 12890605 is 50609821.

It is not a de Polignac number, because 12890605 - 2³ = 12890597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12890609) 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 31 ways as a sum of consecutive naturals, for example, 18310 + ... + 19000.

It is an arithmetic number, because the mean of its divisors is an integer number (610344).

Almost surely, 2^12890605 is an apocalyptic number.

It is an amenable number.

12890605 is a deficient number, since it is larger than the sum of its proper divisors (6640403).

12890605 is a wasteful number, since it uses less digits than its factorization.

12890605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 12890605 is about 3590.3488688427. The cubic root of 12890605 is about 234.4720606584.

The spelling of 12890605 in words is "twelve million, eight hundred ninety thousand, six hundred five".