12500865 has 64 divisors (see below), whose sum is σ = 25401600. Its totient is φ = 5778432.

The previous prime is 12500849. The next prime is 12500867. The reversal of 12500865 is 56800521.

Together with 12900734 it forms a betrothed pair.

It is not a de Polignac number, because 12500865 - 2⁴ = 12500849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12500867) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29626 + ... + 30044.

It is an arithmetic number, because the mean of its divisors is an integer number (396900).

Almost surely, 2^12500865 is an apocalyptic number.

12500865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12500865 is an abundant number, since it is smaller than the sum of its proper divisors (12900735).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12500865 is a wasteful number, since it uses less digits than its factorization.

12500865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 12500865 is about 3535.6562332897. The cubic root of 12500865 is about 232.0847948563.

The spelling of 12500865 in words is "twelve million, five hundred thousand, eight hundred sixty-five".