13821425 has 18 divisors (see below), whose sum is σ = 18215538. Its totient is φ = 10401280.

The previous prime is 13821407. The next prime is 13821427. The reversal of 13821425 is 52412831.

It can be written as a sum of positive squares in 9 ways, for example, as 12769 + 13808656 = 113^2 + 3716^2 .

It is not a de Polignac number, because 13821425 - 2⁸ = 13821169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13821394 and 13821403.

It is not an unprimeable number, because it can be changed into a prime (13821427) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6269 + ... + 8181.

Almost surely, 2^13821425 is an apocalyptic number.

It is an amenable number.

13821425 is a deficient number, since it is larger than the sum of its proper divisors (4394113).

13821425 is a wasteful number, since it uses less digits than its factorization.

13821425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957 (or 1935 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 13821425 is about 3717.7177138669. The cubic root of 13821425 is about 239.9850974543.

The spelling of 13821425 in words is "thirteen million, eight hundred twenty-one thousand, four hundred twenty-five".