13243665 has 32 divisors (see below), whose sum is σ = 23040000. Its totient is φ = 6471360.

The previous prime is 13243661. The next prime is 13243717. The reversal of 13243665 is 56634231.

It is not a de Polignac number, because 13243665 - 2² = 13243661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13243661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8086 + ... + 9584.

It is an arithmetic number, because the mean of its divisors is an integer number (720000).

Almost surely, 2^13243665 is an apocalyptic number.

13243665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13243665 is a deficient number, since it is larger than the sum of its proper divisors (9796335).

13243665 is a wasteful number, since it uses less digits than its factorization.

13243665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557.

The product of its digits is 12960, while the sum is 30.

The square root of 13243665 is about 3639.1846614317. The cubic root of 13243665 is about 236.5934563831.

Adding to 13243665 its reverse (56634231), we get a palindrome (69877896).

The spelling of 13243665 in words is "thirteen million, two hundred forty-three thousand, six hundred sixty-five".