12945605 has 4 divisors (see below), whose sum is σ = 15534732. Its totient is φ = 10356480.

The previous prime is 12945587. The next prime is 12945607. The reversal of 12945605 is 50654921.

It is a happy number.

It is a Cunningham number, because it is equal to 3598²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4656964 + 8288641 = 2158^2 + 2879^2 .

It is not a de Polignac number, because 12945605 - 2¹⁴ = 12929221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12945607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294556 + ... + 1294565.

It is an arithmetic number, because the mean of its divisors is an integer number (3883683).

Almost surely, 2^12945605 is an apocalyptic number.

It is an amenable number.

12945605 is a deficient number, since it is larger than the sum of its proper divisors (2589127).

12945605 is an equidigital number, since it uses as much as digits as its factorization.

12945605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2589126.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 12945605 is about 3598.0001389661. Note that the first 3 decimals coincide. The cubic root of 12945605 is about 234.8050594001.

The spelling of 12945605 in words is "twelve million, nine hundred forty-five thousand, six hundred five".