12900280 has 64 divisors (see below), whose sum is σ = 31337280. Its totient is φ = 4761600.

The previous prime is 12900227. The next prime is 12900289. The reversal of 12900280 is 8200921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12900289) 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 15 ways as a sum of consecutive naturals, for example, 41325 + ... + 41635.

It is an arithmetic number, because the mean of its divisors is an integer number (489645).

Almost surely, 2^12900280 is an apocalyptic number.

12900280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12900280 is the 2074-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12900280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15668640).

12900280 is an abundant number, since it is smaller than the sum of its proper divisors (18437000).

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

12900280 is a wasteful number, since it uses less digits than its factorization.

12900280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 12900280 is about 3591.6959782253. The cubic root of 12900280 is about 234.5307067261.

The spelling of 12900280 in words is "twelve million, nine hundred thousand, two hundred eighty".