4009525 has 24 divisors (see below), whose sum is σ = 5459720. Its totient is φ = 2920320.

The previous prime is 4009507. The next prime is 4009529. The reversal of 4009525 is 5259004.

It can be written as a sum of positive squares in 12 ways, for example, as 3976036 + 33489 = 1994^2 + 183^2 .

It is not a de Polignac number, because 4009525 - 2¹¹ = 4007477 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 4009525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4009529) 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 23 ways as a sum of consecutive naturals, for example, 54889 + ... + 54961.

Almost surely, 2^4009525 is an apocalyptic number.

It is an amenable number.

4009525 is a deficient number, since it is larger than the sum of its proper divisors (1450195).

4009525 is an equidigital number, since it uses as much as digits as its factorization.

4009525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 4009525 is about 2002.3798340974. The cubic root of 4009525 is about 158.8660052750.

The spelling of 4009525 in words is "four million, nine thousand, five hundred twenty-five".