12782417 has 4 divisors (see below), whose sum is σ = 13223220. Its totient is φ = 12341616.

The previous prime is 12782377. The next prime is 12782431. The reversal of 12782417 is 71428721.

It is a happy number.

12782417 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3806401 + 8976016 = 1951^2 + 2996^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12782417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12782467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220358 + ... + 220415.

It is an arithmetic number, because the mean of its divisors is an integer number (3305805).

Almost surely, 2^12782417 is an apocalyptic number.

It is an amenable number.

12782417 is a deficient number, since it is larger than the sum of its proper divisors (440803).

12782417 is an equidigital number, since it uses as much as digits as its factorization.

12782417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440802.

The product of its digits is 6272, while the sum is 32.

The square root of 12782417 is about 3575.2506205859. The cubic root of 12782417 is about 233.8142595499.

The spelling of 12782417 in words is "twelve million, seven hundred eighty-two thousand, four hundred seventeen".