3878809 has 4 divisors (see below), whose sum is σ = 4231440. Its totient is φ = 3526180.

The previous prime is 3878783. The next prime is 3878843. The reversal of 3878809 is 9088783.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3878809 - 2⁷ = 3878681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3878879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176299 + ... + 176320.

It is an arithmetic number, because the mean of its divisors is an integer number (1057860).

Almost surely, 2^3878809 is an apocalyptic number.

It is an amenable number.

3878809 is a deficient number, since it is larger than the sum of its proper divisors (352631).

3878809 is a wasteful number, since it uses less digits than its factorization.

3878809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352630.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 3878809 is about 1969.4692178351. The cubic root of 3878809 is about 157.1204803635.

The spelling of 3878809 in words is "three million, eight hundred seventy-eight thousand, eight hundred nine".