4125209 has 4 divisors (see below), whose sum is σ = 4500240. Its totient is φ = 3750180.

The previous prime is 4125181. The next prime is 4125229. The reversal of 4125209 is 9025214.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4125209 - 2¹² = 4121113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4125229) 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 3 ways as a sum of consecutive naturals, for example, 187499 + ... + 187520.

It is an arithmetic number, because the mean of its divisors is an integer number (1125060).

Almost surely, 2^4125209 is an apocalyptic number.

It is an amenable number.

4125209 is a deficient number, since it is larger than the sum of its proper divisors (375031).

4125209 is a wasteful number, since it uses less digits than its factorization.

4125209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375030.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 4125209 is about 2031.0610527505. The cubic root of 4125209 is about 160.3794250386.

It can be divided in two parts, 4125 and 209, that added together give a palindrome (4334).

The spelling of 4125209 in words is "four million, one hundred twenty-five thousand, two hundred nine".