12988289 has 4 divisors (see below), whose sum is σ = 13752324. Its totient is φ = 12224256.

The previous prime is 12988277. The next prime is 12988291. The reversal of 12988289 is 98288921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98288921 = 71 ⋅1384351.

It can be written as a sum of positive squares in 2 ways, for example, as 3940225 + 9048064 = 1985^2 + 3008^2 .

It is a cyclic number.

It is not a de Polignac number, because 12988289 - 2⁴ = 12988273 is a prime.

It is a super-2 number, since 2×12988289² = 337391302295042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12988219) 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 3 ways as a sum of consecutive naturals, for example, 381992 + ... + 382025.

It is an arithmetic number, because the mean of its divisors is an integer number (3438081).

Almost surely, 2^12988289 is an apocalyptic number.

It is an amenable number.

12988289 is a deficient number, since it is larger than the sum of its proper divisors (764035).

12988289 is an equidigital number, since it uses as much as digits as its factorization.

12988289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764034.

The product of its digits is 165888, while the sum is 47.

The square root of 12988289 is about 3603.9268860508. The cubic root of 12988289 is about 235.0628411993.

The spelling of 12988289 in words is "twelve million, nine hundred eighty-eight thousand, two hundred eighty-nine".