13821255 has 96 divisors (see below), whose sum is σ = 30326400. Its totient is φ = 5677056.

The previous prime is 13821253. The next prime is 13821263. The reversal of 13821255 is 55212831.

It is a happy number.

It is not a de Polignac number, because 13821255 - 2¹ = 13821253 is a prime.

Its product of digits (2400) is a multiple of the sum of its prime divisors (150).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13821251) 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 95 ways as a sum of consecutive naturals, for example, 155251 + ... + 155339.

It is an arithmetic number, because the mean of its divisors is an integer number (315900).

Almost surely, 2^13821255 is an apocalyptic number.

13821255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13821255 is an abundant number, since it is smaller than the sum of its proper divisors (16505145).

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

13821255 is a wasteful number, since it uses less digits than its factorization.

13821255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 150 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 13821255 is about 3717.6948503071. The cubic root of 13821255 is about 239.9841135318.

The spelling of 13821255 in words is "thirteen million, eight hundred twenty-one thousand, two hundred fifty-five".