12788137 has 4 divisors (see below), whose sum is σ = 12796420. Its totient is φ = 12779856.

The previous prime is 12788129. The next prime is 12788177. The reversal of 12788137 is 73188721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 73188721 = 29 ⋅2523749.

It can be written as a sum of positive squares in 2 ways, for example, as 6533136 + 6255001 = 2556^2 + 2501^2 .

It is a cyclic number.

It is not a de Polignac number, because 12788137 - 2³ = 12788129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12788096 and 12788105.

It is not an unprimeable number, because it can be changed into a prime (12788117) 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, 1062 + ... + 5167.

It is an arithmetic number, because the mean of its divisors is an integer number (3199105).

Almost surely, 2^12788137 is an apocalyptic number.

It is an amenable number.

12788137 is a deficient number, since it is larger than the sum of its proper divisors (8283).

12788137 is an equidigital number, since it uses as much as digits as its factorization.

12788137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8282.

The product of its digits is 18816, while the sum is 37.

The square root of 12788137 is about 3576.0504750353. The cubic root of 12788137 is about 233.8491308402.

The spelling of 12788137 in words is "twelve million, seven hundred eighty-eight thousand, one hundred thirty-seven".