13440231 has 12 divisors (see below), whose sum is σ = 22187152. Its totient is φ = 7680096.

The previous prime is 13440221. The next prime is 13440233. The reversal of 13440231 is 13204431.

It is not a de Polignac number, because 13440231 - 2⁵ = 13440199 is a prime.

It is a super-2 number, since 2×13440231² = 361279618666722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440233) 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 in 11 ways as a sum of consecutive naturals, for example, 106606 + ... + 106731.

Almost surely, 2^13440231 is an apocalyptic number.

13440231 is a deficient number, since it is larger than the sum of its proper divisors (8746921).

13440231 is a wasteful number, since it uses less digits than its factorization.

13440231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213350 (or 213347 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 13440231 is about 3666.0920610372. The cubic root of 13440231 is about 237.7582402515.

Adding to 13440231 its reverse (13204431), we get a palindrome (26644662).

The spelling of 13440231 in words is "thirteen million, four hundred forty thousand, two hundred thirty-one".