13440289 has 2 divisors, whose sum is σ = 13440290. Its totient is φ = 13440288.

The previous prime is 13440281. The next prime is 13440293. The reversal of 13440289 is 98204431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12306064 + 1134225 = 3508^2 + 1065^2 .

It is a cyclic number.

It is not a de Polignac number, because 13440289 - 2³ = 13440281 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13440289.

It is not a weakly prime, because it can be changed into another prime (13440281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6720144 + 6720145.

It is an arithmetic number, because the mean of its divisors is an integer number (6720145).

Almost surely, 2^13440289 is an apocalyptic number.

It is an amenable number.

13440289 is a deficient number, since it is larger than the sum of its proper divisors (1).

13440289 is an equidigital number, since it uses as much as digits as its factorization.

13440289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 13440289 is about 3666.0999713592. The cubic root of 13440289 is about 237.7585822585.

The spelling of 13440289 in words is "thirteen million, four hundred forty thousand, two hundred eighty-nine".