3875209 has 4 divisors (see below), whose sum is σ = 4173316. Its totient is φ = 3577104.

The previous prime is 3875177. The next prime is 3875239. The reversal of 3875209 is 9025783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2039184 + 1836025 = 1428^2 + 1355^2 .

It is a cyclic number.

It is not a de Polignac number, because 3875209 - 2⁵ = 3875177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3875239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149034 + ... + 149059.

It is an arithmetic number, because the mean of its divisors is an integer number (1043329).

Almost surely, 2^3875209 is an apocalyptic number.

It is an amenable number.

3875209 is a deficient number, since it is larger than the sum of its proper divisors (298107).

3875209 is a wasteful number, since it uses less digits than its factorization.

3875209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298106.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 3875209 is about 1968.5550538403. Note that the first 3 decimals coincide. The cubic root of 3875209 is about 157.0718564336.

The spelling of 3875209 in words is "three million, eight hundred seventy-five thousand, two hundred nine".