12387867757 has 4 divisors (see below), whose sum is σ = 12433919580. Its totient is φ = 12341815936.

The previous prime is 12387867731. The next prime is 12387867773. The reversal of 12387867757 is 75776878321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1220873481 + 11166994276 = 34941^2 + 105674^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12387867757 is a prime.

It is a super-2 number, since 2×12387867757² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12387867695 and 12387867704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12387867707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23025508 + ... + 23026045.

It is an arithmetic number, because the mean of its divisors is an integer number (3108479895).

Almost surely, 2^12387867757 is an apocalyptic number.

It is an amenable number.

12387867757 is a deficient number, since it is larger than the sum of its proper divisors (46051823).

12387867757 is an equidigital number, since it uses as much as digits as its factorization.

12387867757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46051822.

The product of its digits is 27659520, while the sum is 61.

The spelling of 12387867757 in words is "twelve billion, three hundred eighty-seven million, eight hundred sixty-seven thousand, seven hundred fifty-seven".