3845209 has 8 divisors (see below), whose sum is σ = 4142592. Its totient is φ = 3558720.

The previous prime is 3845183. The next prime is 3845221. The reversal of 3845209 is 9025483.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3845209 - 2⁹ = 3844697 is a prime.

It is a super-3 number, since 3×3845209³ (a number of 21 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

3845209 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3845279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1984 + ... + 3409.

It is an arithmetic number, because the mean of its divisors is an integer number (517824).

Almost surely, 2^3845209 is an apocalyptic number.

It is an amenable number.

3845209 is a deficient number, since it is larger than the sum of its proper divisors (297383).

3845209 is a wasteful number, since it uses less digits than its factorization.

3845209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5447.

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

The square root of 3845209 is about 1960.9204471370. The cubic root of 3845209 is about 156.6654811036.

The spelling of 3845209 in words is "three million, eight hundred forty-five thousand, two hundred nine".