12640105 has 4 divisors (see below), whose sum is σ = 15168132. Its totient is φ = 10112080.

The previous prime is 12640099. The next prime is 12640123. The reversal of 12640105 is 50104621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50104621 = 7 ⋅7157803.

It can be written as a sum of positive squares in 2 ways, for example, as 2679769 + 9960336 = 1637^2 + 3156^2 .

It is not a de Polignac number, because 12640105 - 2³ = 12640097 is a prime.

It is a super-2 number, since 2×12640105² = 319544508822050, which contains 22 as substring.

It is a Duffinian 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, 1264006 + ... + 1264015.

It is an arithmetic number, because the mean of its divisors is an integer number (3792033).

Almost surely, 2^12640105 is an apocalyptic number.

It is an amenable number.

12640105 is a deficient number, since it is larger than the sum of its proper divisors (2528027).

12640105 is an equidigital number, since it uses as much as digits as its factorization.

12640105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528026.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 12640105 is about 3555.2925336743. The cubic root of 12640105 is about 232.9433019158.

Adding to 12640105 its reverse (50104621), we get a palindrome (62744726).

The spelling of 12640105 in words is "twelve million, six hundred forty thousand, one hundred five".