3855215 has 32 divisors (see below), whose sum is σ = 5873280. Its totient is φ = 2363904.

The previous prime is 3855211. The next prime is 3855217. The reversal of 3855215 is 5125583.

3855215 = T₂₆ + T₂₇ + ... + T₂₈₄.

It is a cyclic number.

It is not a de Polignac number, because 3855215 - 2² = 3855211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3855211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16721 + ... + 16949.

It is an arithmetic number, because the mean of its divisors is an integer number (183540).

Almost surely, 2^3855215 is an apocalyptic number.

3855215 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3855215 is a deficient number, since it is larger than the sum of its proper divisors (2018065).

3855215 is a wasteful number, since it uses less digits than its factorization.

3855215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291.

The product of its digits is 6000, while the sum is 29.

The square root of 3855215 is about 1963.4701423755. The cubic root of 3855215 is about 156.8012550009.

The spelling of 3855215 in words is "three million, eight hundred fifty-five thousand, two hundred fifteen".