3878509 has 4 divisors (see below), whose sum is σ = 3882816. Its totient is φ = 3874204.

The previous prime is 3878491. The next prime is 3878519. The reversal of 3878509 is 9058783.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9058783 = 127 ⋅71329.

It is a cyclic number.

It is not a de Polignac number, because 3878509 - 2¹⁵ = 3845741 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3878519) 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, 229 + ... + 2794.

It is an arithmetic number, because the mean of its divisors is an integer number (970704).

Almost surely, 2^3878509 is an apocalyptic number.

It is an amenable number.

3878509 is a deficient number, since it is larger than the sum of its proper divisors (4307).

3878509 is a wasteful number, since it uses less digits than its factorization.

3878509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 3878509 is about 1969.3930537097. The cubic root of 3878509 is about 157.1164295188.

The spelling of 3878509 in words is "three million, eight hundred seventy-eight thousand, five hundred nine".