12489817 has 4 divisors (see below), whose sum is σ = 12618676. Its totient is φ = 12360960.

The previous prime is 12489809. The next prime is 12489857. The reversal of 12489817 is 71898421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71898421 = 7 ⋅10271203.

It can be written as a sum of positive squares in 2 ways, for example, as 9144576 + 3345241 = 3024^2 + 1829^2 .

It is a cyclic number.

It is not a de Polignac number, because 12489817 - 2³ = 12489809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12489817.

It is not an unprimeable number, because it can be changed into a prime (12489857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64284 + ... + 64477.

It is an arithmetic number, because the mean of its divisors is an integer number (3154669).

Almost surely, 2^12489817 is an apocalyptic number.

It is an amenable number.

12489817 is a deficient number, since it is larger than the sum of its proper divisors (128859).

12489817 is an equidigital number, since it uses as much as digits as its factorization.

12489817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128858.

The product of its digits is 32256, while the sum is 40.

The square root of 12489817 is about 3534.0935188532. The cubic root of 12489817 is about 232.0164041611.

The spelling of 12489817 in words is "twelve million, four hundred eighty-nine thousand, eight hundred seventeen".