2785109 has 4 divisors (see below), whose sum is σ = 2796204. Its totient is φ = 2774016.

The previous prime is 2785099. The next prime is 2785129. The reversal of 2785109 is 9015872.

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 1876900 + 908209 = 1370^2 + 953^2 .

It is a cyclic number.

It is not a de Polignac number, because 2785109 - 2⁸ = 2784853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2785129) 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, 5162 + ... + 5675.

It is an arithmetic number, because the mean of its divisors is an integer number (699051).

2^2785109 is an apocalyptic number.

It is an amenable number.

2785109 is a deficient number, since it is larger than the sum of its proper divisors (11095).

2785109 is a wasteful number, since it uses less digits than its factorization.

2785109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11094.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 2785109 is about 1668.8645840810. The cubic root of 2785109 is about 140.6956700925.

The spelling of 2785109 in words is "two million, seven hundred eighty-five thousand, one hundred nine".