12345665 has 8 divisors (see below), whose sum is σ = 14853480. Its totient is φ = 9850752.

The previous prime is 12345653. The next prime is 12345701. The reversal of 12345665 is 56654321.

It can be written as a sum of positive squares in 4 ways, for example, as 1893376 + 10452289 = 1376^2 + 3233^2 .

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 12345665 - 2¹⁰ = 12344641 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 974 + ... + 5063.

It is an arithmetic number, because the mean of its divisors is an integer number (1856685).

Almost surely, 2^12345665 is an apocalyptic number.

It is an amenable number.

12345665 is a deficient number, since it is larger than the sum of its proper divisors (2507815).

12345665 is an equidigital number, since it uses as much as digits as its factorization.

12345665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6451.

The product of its digits is 21600, while the sum is 32.

The square root of 12345665 is about 3513.6398506392. The cubic root of 12345665 is about 231.1203373430.

Adding to 12345665 its reverse (56654321), we get a palindrome (68999986).

The spelling of 12345665 in words is "twelve million, three hundred forty-five thousand, six hundred sixty-five".