3878005 has 4 divisors (see below), whose sum is σ = 4653612. Its totient is φ = 3102400.

The previous prime is 3878003. The next prime is 3878051. The reversal of 3878005 is 5008783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5008783 = 13 ⋅385291.

It can be written as a sum of positive squares in 2 ways, for example, as 1085764 + 2792241 = 1042^2 + 1671^2 .

It is not a de Polignac number, because 3878005 - 2¹ = 3878003 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3878003) 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 3 ways as a sum of consecutive naturals, for example, 387796 + ... + 387805.

It is an arithmetic number, because the mean of its divisors is an integer number (1163403).

Almost surely, 2^3878005 is an apocalyptic number.

It is an amenable number.

3878005 is a deficient number, since it is larger than the sum of its proper divisors (775607).

3878005 is an equidigital number, since it uses as much as digits as its factorization.

3878005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775606.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 3878005 is about 1969.2650913475. The cubic root of 3878005 is about 157.1096236293.

The spelling of 3878005 in words is "three million, eight hundred seventy-eight thousand, five".