3855221 has 8 divisors (see below), whose sum is σ = 3937560. Its totient is φ = 3773952.

The previous prime is 3855217. The next prime is 3855223. The reversal of 3855221 is 1225583.

It can be written as a sum of positive squares in 4 ways, for example, as 130321 + 3724900 = 361^2 + 1930^2 .

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 3855221 - 2² = 3855217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3855223) 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, 12161 + ... + 12473.

It is an arithmetic number, because the mean of its divisors is an integer number (492195).

Almost surely, 2^3855221 is an apocalyptic number.

It is an amenable number.

3855221 is a deficient number, since it is larger than the sum of its proper divisors (82339).

3855221 is a wasteful number, since it uses less digits than its factorization.

3855221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535.

The product of its digits is 2400, while the sum is 26.

The square root of 3855221 is about 1963.4716702820. The cubic root of 3855221 is about 156.8013363459.

The spelling of 3855221 in words is "three million, eight hundred fifty-five thousand, two hundred twenty-one".