12943985 has 8 divisors (see below), whose sum is σ = 15553320. Its totient is φ = 10341504.

The previous prime is 12943981. The next prime is 12944023. The reversal of 12943985 is 58934921.

It can be written as a sum of positive squares in 4 ways, for example, as 12769 + 12931216 = 113^2 + 3596^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12943985 - 2² = 12943981 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12943981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4499 + ... + 6791.

It is an arithmetic number, because the mean of its divisors is an integer number (1944165).

Almost surely, 2^12943985 is an apocalyptic number.

It is an amenable number.

12943985 is a deficient number, since it is larger than the sum of its proper divisors (2609335).

12943985 is a wasteful number, since it uses less digits than its factorization.

12943985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3427.

The product of its digits is 77760, while the sum is 41.

The square root of 12943985 is about 3597.7750068619. The cubic root of 12943985 is about 234.7952645685.

The spelling of 12943985 in words is "twelve million, nine hundred forty-three thousand, nine hundred eighty-five".