12706405 has 4 divisors (see below), whose sum is σ = 15247692. Its totient is φ = 10165120.

The previous prime is 12706399. The next prime is 12706409. The reversal of 12706405 is 50460721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50460721 = 1489 ⋅33889.

It can be written as a sum of positive squares in 2 ways, for example, as 9498724 + 3207681 = 3082^2 + 1791^2 .

It is not a de Polignac number, because 12706405 - 2⁷ = 12706277 is a prime.

It is a super-2 number, since 2×12706405² = 322905456048050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12706405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12706409) 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 3 ways as a sum of consecutive naturals, for example, 1270636 + ... + 1270645.

It is an arithmetic number, because the mean of its divisors is an integer number (3811923).

Almost surely, 2^12706405 is an apocalyptic number.

It is an amenable number.

12706405 is a deficient number, since it is larger than the sum of its proper divisors (2541287).

12706405 is an equidigital number, since it uses as much as digits as its factorization.

12706405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541286.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 12706405 is about 3564.6044661365. The cubic root of 12706405 is about 233.3498707100.

The spelling of 12706405 in words is "twelve million, seven hundred six thousand, four hundred five".