2878109 has 4 divisors (see below), whose sum is σ = 3099516. Its totient is φ = 2656704.

The previous prime is 2878093. The next prime is 2878123. The reversal of 2878109 is 9018782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1315609 + 1562500 = 1147^2 + 1250^2 .

It is a cyclic number.

It is not a de Polignac number, because 2878109 - 2⁴ = 2878093 is a prime.

It is a super-2 number, since 2×2878109² = 16567022831762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2878409) 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, 110684 + ... + 110709.

It is an arithmetic number, because the mean of its divisors is an integer number (774879).

2^2878109 is an apocalyptic number.

It is an amenable number.

2878109 is a deficient number, since it is larger than the sum of its proper divisors (221407).

2878109 is a wasteful number, since it uses less digits than its factorization.

2878109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221406.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 2878109 is about 1696.4990421453. The cubic root of 2878109 is about 142.2445860783.

The spelling of 2878109 in words is "two million, eight hundred seventy-eight thousand, one hundred nine".