16525405 has 16 divisors (see below), whose sum is σ = 21584304. Its totient is φ = 12072960.

The previous prime is 16525403. The next prime is 16525409. The reversal of 16525405 is 50452561.

It can be written as a sum of positive squares in 8 ways, for example, as 219961 + 16305444 = 469^2 + 4038^2 .

It is not a de Polignac number, because 16525405 - 2¹ = 16525403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16525403) 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 15 ways as a sum of consecutive naturals, for example, 4995 + ... + 7615.

It is an arithmetic number, because the mean of its divisors is an integer number (1349019).

Almost surely, 2^16525405 is an apocalyptic number.

It is an amenable number.

16525405 is a deficient number, since it is larger than the sum of its proper divisors (5058899).

16525405 is a wasteful number, since it uses less digits than its factorization.

16525405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 16525405 is about 4065.1451388604. The cubic root of 16525405 is about 254.7127612792.

Adding to 16525405 its reverse (50452561), we get a palindrome (66977966).

The spelling of 16525405 in words is "sixteen million, five hundred twenty-five thousand, four hundred five".