3878217 has 12 divisors (see below), whose sum is σ = 6402240. Its totient is φ = 2216088.

The previous prime is 3878209. The next prime is 3878219. The reversal of 3878217 is 7128783.

It is not a de Polignac number, because 3878217 - 2³ = 3878209 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30717 + ... + 30842.

It is an arithmetic number, because the mean of its divisors is an integer number (533520).

Almost surely, 2^3878217 is an apocalyptic number.

It is an amenable number.

3878217 is a deficient number, since it is larger than the sum of its proper divisors (2524023).

3878217 is a wasteful number, since it uses less digits than its factorization.

3878217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61572 (or 61569 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 3878217 is about 1969.3189177987. The cubic root of 3878217 is about 157.1124864959.

It can be divided in two parts, 3878 and 217, that added together give a triangular number (4095 = T₉₀).

The spelling of 3878217 in words is "three million, eight hundred seventy-eight thousand, two hundred seventeen".