12127765 has 8 divisors (see below), whose sum is σ = 15672888. Its totient is φ = 8955840.

The previous prime is 12127751. The next prime is 12127769. The reversal of 12127765 is 56772121.

It can be written as a sum of positive squares in 4 ways, for example, as 2053489 + 10074276 = 1433^2 + 3174^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12127765 - 2⁵ = 12127733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12127769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93226 + ... + 93355.

It is an arithmetic number, because the mean of its divisors is an integer number (1959111).

Almost surely, 2^12127765 is an apocalyptic number.

It is an amenable number.

12127765 is a deficient number, since it is larger than the sum of its proper divisors (3545123).

12127765 is a wasteful number, since it uses less digits than its factorization.

12127765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186599.

The product of its digits is 5880, while the sum is 31.

The square root of 12127765 is about 3482.4940775255. The cubic root of 12127765 is about 229.7525063044.

Adding to 12127765 its reverse (56772121), we get a palindrome (68899886).

The spelling of 12127765 in words is "twelve million, one hundred twenty-seven thousand, seven hundred sixty-five".