13440287 has 8 divisors (see below), whose sum is σ = 15775776. Its totient is φ = 11208672.

The previous prime is 13440281. The next prime is 13440289. The reversal of 13440287 is 78204431.

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

It is a cyclic number.

It is not a de Polignac number, because 13440287 - 2¹² = 13436191 is a prime.

It is a super-3 number, since 3×13440287³ (a number of 22 digits) contains 333 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 (13440281) 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 7 ways as a sum of consecutive naturals, for example, 25688 + ... + 26205.

It is an arithmetic number, because the mean of its divisors is an integer number (1971972).

Almost surely, 2^13440287 is an apocalyptic number.

13440287 is a deficient number, since it is larger than the sum of its proper divisors (2335489).

13440287 is an equidigital number, since it uses as much as digits as its factorization.

13440287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51937.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 13440287 is about 3666.0996985898. The cubic root of 13440287 is about 237.7585704651.

The spelling of 13440287 in words is "thirteen million, four hundred forty thousand, two hundred eighty-seven".