13421725 has 6 divisors (see below), whose sum is σ = 16642970. Its totient is φ = 10737360.

The previous prime is 13421717. The next prime is 13421731. The reversal of 13421725 is 52712431.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3755844 + 9665881 = 1938^2 + 3109^2 .

It is not a de Polignac number, because 13421725 - 2³ = 13421717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 536869 = 13421725 / (1 + 3 + 4 + 2 + 1 + 7 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 13421725.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 268410 + ... + 268459.

Almost surely, 2^13421725 is an apocalyptic number.

It is an amenable number.

13421725 is a deficient number, since it is larger than the sum of its proper divisors (3221245).

13421725 is an equidigital number, since it uses as much as digits as its factorization.

13421725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536879 (or 536874 counting only the distinct ones).

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

The square root of 13421725 is about 3663.5672506452. The cubic root of 13421725 is about 237.6490661610.

The spelling of 13421725 in words is "thirteen million, four hundred twenty-one thousand, seven hundred twenty-five".