12555765 has 24 divisors (see below), whose sum is σ = 22354488. Its totient is φ = 6514560.

The previous prime is 12555757. The next prime is 12555779. The reversal of 12555765 is 56755521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1306449 + 11249316 = 1143^2 + 3354^2 .

It is not a de Polignac number, because 12555765 - 2³ = 12555757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2106 + ... + 5435.

It is an arithmetic number, because the mean of its divisors is an integer number (931437).

Almost surely, 2^12555765 is an apocalyptic number.

12555765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12555765 is a deficient number, since it is larger than the sum of its proper divisors (9798723).

12555765 is a wasteful number, since it uses less digits than its factorization.

12555765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7589 (or 7586 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 12555765 is about 3543.4114917689. The cubic root of 12555765 is about 232.4240473377.

The spelling of 12555765 in words is "twelve million, five hundred fifty-five thousand, seven hundred sixty-five".