3878345 has 4 divisors (see below), whose sum is σ = 4654020. Its totient is φ = 3102672.

The previous prime is 3878323. The next prime is 3878359. The reversal of 3878345 is 5438783.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5438783 = 7 ⋅776969.

It can be written as a sum of positive squares in 2 ways, for example, as 2569609 + 1308736 = 1603^2 + 1144^2 .

It is a cyclic number.

It is not a de Polignac number, because 3878345 - 2¹⁴ = 3861961 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 3878299 and 3878308.

It is an unprimeable number.

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, 387830 + ... + 387839.

It is an arithmetic number, because the mean of its divisors is an integer number (1163505).

Almost surely, 2^3878345 is an apocalyptic number.

It is an amenable number.

3878345 is a deficient number, since it is larger than the sum of its proper divisors (775675).

3878345 is an equidigital number, since it uses as much as digits as its factorization.

3878345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775674.

The product of its digits is 80640, while the sum is 38.

The square root of 3878345 is about 1969.3514160759. The cubic root of 3878345 is about 157.1142149687.

The spelling of 3878345 in words is "three million, eight hundred seventy-eight thousand, three hundred forty-five".