12756905 has 12 divisors (see below), whose sum is σ = 17807940. Its totient is φ = 8747424.

The previous prime is 12756883. The next prime is 12756907. The reversal of 12756905 is 50965721.

12756905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8317456 + 4439449 = 2884^2 + 2107^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12756905 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (12756907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25790 + ... + 26279.

It is an arithmetic number, because the mean of its divisors is an integer number (1483995).

Almost surely, 2^12756905 is an apocalyptic number.

It is an amenable number.

12756905 is a deficient number, since it is larger than the sum of its proper divisors (5051035).

12756905 is an equidigital number, since it uses as much as digits as its factorization.

12756905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52088 (or 52081 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 12756905 is about 3571.6809767951. The cubic root of 12756905 is about 233.6586019178.

The spelling of 12756905 in words is "twelve million, seven hundred fifty-six thousand, nine hundred five".