13643265 has 16 divisors (see below), whose sum is σ = 23113728. Its totient is φ = 6848256.

The previous prime is 13643261. The next prime is 13643293. The reversal of 13643265 is 56234631.

It is not a de Polignac number, because 13643265 - 2² = 13643261 is a prime.

It is a super-2 number, since 2×13643265² = 372277359720450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13643261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26497 + ... + 27006.

It is an arithmetic number, because the mean of its divisors is an integer number (1444608).

Almost surely, 2^13643265 is an apocalyptic number.

13643265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13643265 is a deficient number, since it is larger than the sum of its proper divisors (9470463).

13643265 is a wasteful number, since it uses less digits than its factorization.

13643265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53528.

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

The square root of 13643265 is about 3693.6790602325. The cubic root of 13643265 is about 238.9494883420.

Adding to 13643265 its reverse (56234631), we get a palindrome (69877896).

The spelling of 13643265 in words is "thirteen million, six hundred forty-three thousand, two hundred sixty-five".