13643243 has 2 divisors, whose sum is σ = 13643244. Its totient is φ = 13643242.

The previous prime is 13643239. The next prime is 13643261. The reversal of 13643243 is 34234631.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13643243 - 2² = 13643239 is a prime.

It is a super-2 number, since 2×13643243² = 372276159114098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13643213) 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 as a sum of consecutive naturals, namely, 6821621 + 6821622.

It is an arithmetic number, because the mean of its divisors is an integer number (6821622).

Almost surely, 2^13643243 is an apocalyptic number.

13643243 is a deficient number, since it is larger than the sum of its proper divisors (1).

13643243 is an equidigital number, since it uses as much as digits as its factorization.

13643243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 26.

The square root of 13643243 is about 3693.6760821707. The cubic root of 13643243 is about 238.9493599052.

Adding to 13643243 its reverse (34234631), we get a palindrome (47877874).

The spelling of 13643243 in words is "thirteen million, six hundred forty-three thousand, two hundred forty-three".