12979787 has 4 divisors (see below), whose sum is σ = 13047936. Its totient is φ = 12911640.

The previous prime is 12979783. The next prime is 12979801. The reversal of 12979787 is 78797921.

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 12979787 - 2² = 12979783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12979783) 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, 33788 + ... + 34169.

It is an arithmetic number, because the mean of its divisors is an integer number (3261984).

Almost surely, 2^12979787 is an apocalyptic number.

12979787 is a deficient number, since it is larger than the sum of its proper divisors (68149).

12979787 is an equidigital number, since it uses as much as digits as its factorization.

12979787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68148.

The product of its digits is 444528, while the sum is 50.

The square root of 12979787 is about 3602.7471462760. The cubic root of 12979787 is about 235.0115401003.

The spelling of 12979787 in words is "twelve million, nine hundred seventy-nine thousand, seven hundred eighty-seven".