12780979 has 4 divisors (see below), whose sum is σ = 12800376. Its totient is φ = 12761584.

The previous prime is 12780973. The next prime is 12780983. The reversal of 12780979 is 97908721.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12780979 - 2¹⁷ = 12649907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12780973) 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 3 ways as a sum of consecutive naturals, for example, 8674 + ... + 10039.

It is an arithmetic number, because the mean of its divisors is an integer number (3200094).

Almost surely, 2^12780979 is an apocalyptic number.

12780979 is a deficient number, since it is larger than the sum of its proper divisors (19397).

12780979 is an equidigital number, since it uses as much as digits as its factorization.

12780979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19396.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 12780979 is about 3575.0495101467. The cubic root of 12780979 is about 233.8054913200.

The spelling of 12780979 in words is "twelve million, seven hundred eighty thousand, nine hundred seventy-nine".