15440225 has 24 divisors (see below), whose sum is σ = 20034432. Its totient is φ = 11793600.

The previous prime is 15440219. The next prime is 15440237. The reversal of 15440225 is 52204451.

It is a happy number.

It is not a de Polignac number, because 15440225 - 2¹⁰ = 15439201 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 15440225.

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 23 ways as a sum of consecutive naturals, for example, 56840 + ... + 57110.

It is an arithmetic number, because the mean of its divisors is an integer number (834768).

Almost surely, 2^15440225 is an apocalyptic number.

It is an amenable number.

15440225 is a deficient number, since it is larger than the sum of its proper divisors (4594207).

15440225 is a wasteful number, since it uses less digits than its factorization.

15440225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 15440225 is about 3929.4051712696. The cubic root of 15440225 is about 249.0106230314.

Adding to 15440225 its reverse (52204451), we get a palindrome (67644676).

The spelling of 15440225 in words is "fifteen million, four hundred forty thousand, two hundred twenty-five".