12985864 has 8 divisors (see below), whose sum is σ = 24348510. Its totient is φ = 6492928.

The previous prime is 12985801. The next prime is 12985867. The reversal of 12985864 is 46858921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7022500 + 5963364 = 2650^2 + 2442^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 12985864.

It is not an unprimeable number, because it can be changed into a prime (12985867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811609 + ... + 811624.

Almost surely, 2^12985864 is an apocalyptic number.

It is an amenable number.

12985864 is a deficient number, since it is larger than the sum of its proper divisors (11362646).

12985864 is a wasteful number, since it uses less digits than its factorization.

12985864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623239 (or 1623235 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 12985864 is about 3603.5904317777. The cubic root of 12985864 is about 235.0482110231.

The spelling of 12985864 in words is "twelve million, nine hundred eighty-five thousand, eight hundred sixty-four".