13120756 has 18 divisors (see below), whose sum is σ = 25239410. Its totient is φ = 5963760.

The previous prime is 13120739. The next prime is 13120759. The reversal of 13120756 is 65702131.

It can be written as a sum of positive squares in only one way, i.e., 10176100 + 2944656 = 3190^2 + 1716^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13120756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13120759) 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 5 ways as a sum of consecutive naturals, for example, 13071 + ... + 14038.

Almost surely, 2^13120756 is an apocalyptic number.

It is an amenable number.

13120756 is a deficient number, since it is larger than the sum of its proper divisors (12118654).

13120756 is a wasteful number, since it uses less digits than its factorization.

13120756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27135 (or 27122 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 13120756 is about 3622.2584115438. The cubic root of 13120756 is about 235.8592716486.

Adding to 13120756 its reverse (65702131), we get a palindrome (78822887).

The spelling of 13120756 in words is "thirteen million, one hundred twenty thousand, seven hundred fifty-six".