12787956 has 60 divisors (see below), whose sum is σ = 34608420. Its totient is φ = 4112640.

The previous prime is 12787937. The next prime is 12787981. The reversal of 12787956 is 65978721.

It can be written as a sum of positive squares in 2 ways, for example, as 4284900 + 8503056 = 2070^2 + 2916^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8716 + ... + 10076.

It is an arithmetic number, because the mean of its divisors is an integer number (576807).

Almost surely, 2^12787956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12787956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17304210).

12787956 is an abundant number, since it is smaller than the sum of its proper divisors (21820464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12787956 is a wasteful number, since it uses less digits than its factorization.

12787956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406 (or 1395 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 12787956 is about 3576.0251676967. The cubic root of 12787956 is about 233.8480275549.

The spelling of 12787956 in words is "twelve million, seven hundred eighty-seven thousand, nine hundred fifty-six".