12865987 has 6 divisors (see below), whose sum is σ = 13189308. Its totient is φ = 12543804.

The previous prime is 12865969. The next prime is 12865997. The reversal of 12865987 is 78956821.

It is not a de Polignac number, because 12865987 - 2⁷ = 12865859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12865927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23248 + ... + 23794.

It is an arithmetic number, because the mean of its divisors is an integer number (2198218).

Almost surely, 2^12865987 is an apocalyptic number.

12865987 is a deficient number, since it is larger than the sum of its proper divisors (323321).

12865987 is an frugal number, since it uses more digits than its factorization.

12865987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137 (or 590 counting only the distinct ones).

The product of its digits is 241920, while the sum is 46.

The square root of 12865987 is about 3586.9188727932. The cubic root of 12865987 is about 234.3227035200.

The spelling of 12865987 in words is "twelve million, eight hundred sixty-five thousand, nine hundred eighty-seven".