16409425 has 6 divisors (see below), whose sum is σ = 20347718. Its totient is φ = 13127520.

The previous prime is 16409423. The next prime is 16409429. The reversal of 16409425 is 52490461.

It can be written as a sum of positive squares in 3 ways, for example, as 2660161 + 13749264 = 1631^2 + 3708^2 .

It is not a de Polignac number, because 16409425 - 2¹ = 16409423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16409423) 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, 328164 + ... + 328213.

Almost surely, 2^16409425 is an apocalyptic number.

It is an amenable number.

16409425 is a deficient number, since it is larger than the sum of its proper divisors (3938293).

16409425 is an equidigital number, since it uses as much as digits as its factorization.

16409425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656387 (or 656382 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 16409425 is about 4050.8548480537. The cubic root of 16409425 is about 254.1154795544.

Adding to 16409425 its reverse (52490461), we get a palindrome (68899886).

The spelling of 16409425 in words is "sixteen million, four hundred nine thousand, four hundred twenty-five".