3878909 has 4 divisors (see below), whose sum is σ = 3902304. Its totient is φ = 3855516.

The previous prime is 3878899. The next prime is 3878921. The reversal of 3878909 is 9098783.

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 3878909 - 2⁴ = 3878893 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3878909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3878209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11447 + ... + 11780.

It is an arithmetic number, because the mean of its divisors is an integer number (975576).

Almost surely, 2^3878909 is an apocalyptic number.

It is an amenable number.

3878909 is a deficient number, since it is larger than the sum of its proper divisors (23395).

3878909 is a wasteful number, since it uses less digits than its factorization.

3878909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23394.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 3878909 is about 1969.4946052224. The cubic root of 3878909 is about 157.1218305987.

The spelling of 3878909 in words is "three million, eight hundred seventy-eight thousand, nine hundred nine".