3878215 has 16 divisors (see below), whose sum is σ = 5132160. Its totient is φ = 2789920.

The previous prime is 3878209. The next prime is 3878219. The reversal of 3878215 is 5128783.

It is not a de Polignac number, because 3878215 - 2³ = 3878207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3878219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5556 + ... + 6214.

It is an arithmetic number, because the mean of its divisors is an integer number (320760).

Almost surely, 2^3878215 is an apocalyptic number.

3878215 is a deficient number, since it is larger than the sum of its proper divisors (1253945).

3878215 is a wasteful number, since it uses less digits than its factorization.

3878215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782.

The product of its digits is 13440, while the sum is 34.

The square root of 3878215 is about 1969.3184100089. The cubic root of 3878215 is about 157.1124594882.

The spelling of 3878215 in words is "three million, eight hundred seventy-eight thousand, two hundred fifteen".