13821280 has 48 divisors (see below), whose sum is σ = 35625744. Its totient is φ = 5025280.

The previous prime is 13821263. The next prime is 13821293. The reversal of 13821280 is 8212831.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2167 + ... + 5686.

It is an arithmetic number, because the mean of its divisors is an integer number (742203).

Almost surely, 2^13821280 is an apocalyptic number.

13821280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13821280 is an abundant number, since it is smaller than the sum of its proper divisors (21804464).

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

13821280 is a wasteful number, since it uses less digits than its factorization.

13821280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7879 (or 7871 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 13821280 is about 3717.6982126041. The cubic root of 13821280 is about 239.9842582268.

It can be divided in two parts, 1382 and 1280, that added together give a palindrome (2662).

The spelling of 13821280 in words is "thirteen million, eight hundred twenty-one thousand, two hundred eighty".