16403225 has 6 divisors (see below), whose sum is σ = 20340030. Its totient is φ = 13122560.

The previous prime is 16403197. The next prime is 16403227. The reversal of 16403225 is 52230461.

It can be written as a sum of positive squares in 3 ways, for example, as 3579664 + 12823561 = 1892^2 + 3581^2 .

It is not a de Polignac number, because 16403225 - 2¹⁴ = 16386841 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16403225.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16403227) 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 5 ways as a sum of consecutive naturals, for example, 328040 + ... + 328089.

It is an arithmetic number, because the mean of its divisors is an integer number (3390005).

Almost surely, 2^16403225 is an apocalyptic number.

It is an amenable number.

16403225 is a deficient number, since it is larger than the sum of its proper divisors (3936805).

16403225 is an equidigital number, since it uses as much as digits as its factorization.

16403225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656139 (or 656134 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 16403225 is about 4050.0895051838. The cubic root of 16403225 is about 254.0834712331.

Adding to 16403225 its reverse (52230461), we get a palindrome (68633686).

It can be divided in two parts, 16 and 403225, that multiplied together give a square (6451600 = 2540²).

The spelling of 16403225 in words is "sixteen million, four hundred three thousand, two hundred twenty-five".