13821525 has 36 divisors (see below), whose sum is σ = 25301952. Its totient is φ = 7209120.

The previous prime is 13821523. The next prime is 13821539. The reversal of 13821525 is 52512831.

It is a happy number.

13821525 is a `hidden beast` number, since 138 + 2 + 1 + 525 = 666.

It is not a de Polignac number, because 13821525 - 2¹ = 13821523 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13821523) 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 35 ways as a sum of consecutive naturals, for example, 9922 + ... + 11228.

It is an arithmetic number, because the mean of its divisors is an integer number (702832).

Almost surely, 2^13821525 is an apocalyptic number.

13821525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13821525 is a deficient number, since it is larger than the sum of its proper divisors (11480427).

13821525 is a wasteful number, since it uses less digits than its factorization.

13821525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370 (or 1362 counting only the distinct ones).

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

The square root of 13821525 is about 3717.7311629541. The cubic root of 13821525 is about 239.9856762285.

The spelling of 13821525 in words is "thirteen million, eight hundred twenty-one thousand, five hundred twenty-five".