3878609 has 4 divisors (see below), whose sum is σ = 4432704. Its totient is φ = 3324516.

The previous prime is 3878597. The next prime is 3878617. The reversal of 3878609 is 9068783.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9068783 = 541 ⋅16763.

It is a cyclic number.

It is not a de Polignac number, because 3878609 - 2¹² = 3874513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3878629) 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, 277037 + ... + 277050.

It is an arithmetic number, because the mean of its divisors is an integer number (1108176).

Almost surely, 2^3878609 is an apocalyptic number.

It is an amenable number.

3878609 is a deficient number, since it is larger than the sum of its proper divisors (554095).

3878609 is an equidigital number, since it uses as much as digits as its factorization.

3878609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554094.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 3878609 is about 1969.4184420788. The cubic root of 3878609 is about 157.1177798236.

The spelling of 3878609 in words is "three million, eight hundred seventy-eight thousand, six hundred nine".