12690005 has 24 divisors (see below), whose sum is σ = 16682400. Its totient is φ = 9240480.

The previous prime is 12689993. The next prime is 12690011. The reversal of 12690005 is 50009621.

It is not a de Polignac number, because 12690005 - 2¹⁰ = 12688981 is a prime.

It is a super-2 number, since 2×12690005² = 322072453800050, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91226 + ... + 91364.

It is an arithmetic number, because the mean of its divisors is an integer number (695100).

Almost surely, 2^12690005 is an apocalyptic number.

It is an amenable number.

12690005 is a deficient number, since it is larger than the sum of its proper divisors (3992395).

12690005 is a wasteful number, since it uses less digits than its factorization.

12690005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 194 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 12690005 is about 3562.3033279046. The cubic root of 12690005 is about 233.2494335546.

Adding to 12690005 its reverse (50009621), we get a palindrome (62699626).

The spelling of 12690005 in words is "twelve million, six hundred ninety thousand, five".