12447661 has 4 divisors (see below), whose sum is σ = 12513024. Its totient is φ = 12382300.

The previous prime is 12447613. The next prime is 12447667. The reversal of 12447661 is 16674421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16674421 = 71 ⋅234851.

It is a cyclic number.

It is not a de Polignac number, because 12447661 - 2¹¹ = 12445613 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12447667) 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, 32395 + ... + 32776.

It is an arithmetic number, because the mean of its divisors is an integer number (3128256).

Almost surely, 2^12447661 is an apocalyptic number.

It is an amenable number.

12447661 is a deficient number, since it is larger than the sum of its proper divisors (65363).

12447661 is an equidigital number, since it uses as much as digits as its factorization.

12447661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65362.

The product of its digits is 8064, while the sum is 31.

The square root of 12447661 is about 3528.1242891939. The cubic root of 12447661 is about 231.7550737120.

The spelling of 12447661 in words is "twelve million, four hundred forty-seven thousand, six hundred sixty-one".