12506817 has 4 divisors (see below), whose sum is σ = 16675760. Its totient is φ = 8337876.

The previous prime is 12506783. The next prime is 12506821. The reversal of 12506817 is 71860521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12506817 - 2⁸ = 12506561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12506717) 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, 2084467 + ... + 2084472.

It is an arithmetic number, because the mean of its divisors is an integer number (4168940).

Almost surely, 2^12506817 is an apocalyptic number.

It is an amenable number.

12506817 is a deficient number, since it is larger than the sum of its proper divisors (4168943).

12506817 is an equidigital number, since it uses as much as digits as its factorization.

12506817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4168942.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 12506817 is about 3536.4978439128. The cubic root of 12506817 is about 232.1216229617.

The spelling of 12506817 in words is "twelve million, five hundred six thousand, eight hundred seventeen".