13440531 has 8 divisors (see below), whose sum is σ = 19299280. Its totient is φ = 8271072.

The previous prime is 13440529. The next prime is 13440547. The reversal of 13440531 is 13504431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13440531 - 2¹ = 13440529 is a prime.

It is a super-2 number, since 2×13440531² = 361295747123922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13440498 and 13440507.

It is not an unprimeable number, because it can be changed into a prime (13440551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172276 + ... + 172353.

It is an arithmetic number, because the mean of its divisors is an integer number (2412410).

Almost surely, 2^13440531 is an apocalyptic number.

13440531 is a deficient number, since it is larger than the sum of its proper divisors (5858749).

13440531 is a wasteful number, since it uses less digits than its factorization.

13440531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344645.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 13440531 is about 3666.1329763117. The cubic root of 13440531 is about 237.7600092425.

Adding to 13440531 its reverse (13504431), we get a palindrome (26944962).

The spelling of 13440531 in words is "thirteen million, four hundred forty thousand, five hundred thirty-one".