3805218 has 40 divisors (see below), whose sum is σ = 8659728. Its totient is φ = 1248696.

The previous prime is 3805211. The next prime is 3805223. The reversal of 3805218 is 8125083.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 3805191 and 3805200.

It is not an unprimeable number, because it can be changed into a prime (3805211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13305 + ... + 13587.

Almost surely, 2^3805218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3805218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4329864).

3805218 is an abundant number, since it is smaller than the sum of its proper divisors (4854510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3805218 is a wasteful number, since it uses less digits than its factorization.

3805218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 3805218 is about 1950.6967985825. The cubic root of 3805218 is about 156.1204690755.

The spelling of 3805218 in words is "three million, eight hundred five thousand, two hundred eighteen".