12289280 has 36 divisors (see below), whose sum is σ = 29439732. Its totient is φ = 4915200.

The previous prime is 12289279. The next prime is 12289289. The reversal of 12289280 is 8298221.

It can be written as a sum of positive squares in 2 ways, for example, as 7054336 + 5234944 = 2656^2 + 2288^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12289289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3521 + ... + 6080.

Almost surely, 2^12289280 is an apocalyptic number.

12289280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12289280 is an abundant number, since it is smaller than the sum of its proper divisors (17150452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12289280 is an frugal number, since it uses more digits than its factorization.

12289280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9622 (or 9608 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 12289280 is about 3505.6069374646. The cubic root of 12289280 is about 230.7679434686.

The spelling of 12289280 in words is "twelve million, two hundred eighty-nine thousand, two hundred eighty".