12720709 has 8 divisors (see below), whose sum is σ = 14178240. Its totient is φ = 11342016.

The previous prime is 12720707. The next prime is 12720713. The reversal of 12720709 is 90702721.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12720709 - 2¹ = 12720707 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12720707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19369 + ... + 20014.

It is an arithmetic number, because the mean of its divisors is an integer number (1772280).

Almost surely, 2^12720709 is an apocalyptic number.

12720709 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12720709 is a deficient number, since it is larger than the sum of its proper divisors (1457531).

12720709 is a wasteful number, since it uses less digits than its factorization.

12720709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39419.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 12720709 is about 3566.6102955047. The cubic root of 12720709 is about 233.4374009708.

The spelling of 12720709 in words is "twelve million, seven hundred twenty thousand, seven hundred nine".