13721425 has 12 divisors (see below), whose sum is σ = 17065996. Its totient is φ = 10944000.

The previous prime is 13721423. The next prime is 13721441. The reversal of 13721425 is 52412731.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1274641 + 12446784 = 1129^2 + 3528^2 .

It is not a de Polignac number, because 13721425 - 2¹ = 13721423 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13721425.

It is not an unprimeable number, because it can be changed into a prime (13721423) 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 11 ways as a sum of consecutive naturals, for example, 10825 + ... + 12025.

Almost surely, 2^13721425 is an apocalyptic number.

It is an amenable number.

13721425 is a deficient number, since it is larger than the sum of its proper divisors (3344571).

13721425 is a wasteful number, since it uses less digits than its factorization.

13721425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668 (or 1663 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 13721425 is about 3704.2441874153. The cubic root of 13721425 is about 239.4049203965.

The spelling of 13721425 in words is "thirteen million, seven hundred twenty-one thousand, four hundred twenty-five".