12985405 has 4 divisors (see below), whose sum is σ = 15582492. Its totient is φ = 10388320.

The previous prime is 12985393. The next prime is 12985421. The reversal of 12985405 is 50458921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50458921 = 1493 ⋅33797.

It can be written as a sum of positive squares in 2 ways, for example, as 2815684 + 10169721 = 1678^2 + 3189^2 .

It is not a de Polignac number, because 12985405 - 2⁷ = 12985277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1298536 + ... + 1298545.

It is an arithmetic number, because the mean of its divisors is an integer number (3895623).

Almost surely, 2^12985405 is an apocalyptic number.

It is an amenable number.

12985405 is a deficient number, since it is larger than the sum of its proper divisors (2597087).

12985405 is an equidigital number, since it uses as much as digits as its factorization.

12985405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597086.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 12985405 is about 3603.5267447322. The cubic root of 12985405 is about 235.0454416425.

The spelling of 12985405 in words is "twelve million, nine hundred eighty-five thousand, four hundred five".