12861765 has 72 divisors (see below), whose sum is σ = 27387360. Its totient is φ = 5552064.

The previous prime is 12861743. The next prime is 12861767. The reversal of 12861765 is 56716821.

It is not a de Polignac number, because 12861765 - 2⁶ = 12861701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12861767) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 41742 + ... + 42048.

It is an arithmetic number, because the mean of its divisors is an integer number (380380).

Almost surely, 2^12861765 is an apocalyptic number.

12861765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12861765 is an abundant number, since it is smaller than the sum of its proper divisors (14525595).

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

12861765 is a wasteful number, since it uses less digits than its factorization.

12861765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 341 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 12861765 is about 3586.3302971143. The cubic root of 12861765 is about 234.2970695574.

The spelling of 12861765 in words is "twelve million, eight hundred sixty-one thousand, seven hundred sixty-five".