12888765 has 24 divisors (see below), whose sum is σ = 22947288. Its totient is φ = 6687360.

The previous prime is 12888749. The next prime is 12888767. The reversal of 12888765 is 56788821.

It can be written as a sum of positive squares in 4 ways, for example, as 1879641 + 11009124 = 1371^2 + 3318^2 .

It is not a de Polignac number, because 12888765 - 2⁴ = 12888749 is a prime.

It is a super-2 number, since 2×12888765² = 332240526450450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12888765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12888767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2206 + ... + 5535.

It is an arithmetic number, because the mean of its divisors is an integer number (956137).

Almost surely, 2^12888765 is an apocalyptic number.

12888765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12888765 is a deficient number, since it is larger than the sum of its proper divisors (10058523).

12888765 is a wasteful number, since it uses less digits than its factorization.

12888765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7789 (or 7786 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 12888765 is about 3590.0926171897. The cubic root of 12888765 is about 234.4609039770.

The spelling of 12888765 in words is "twelve million, eight hundred eighty-eight thousand, seven hundred sixty-five".