2186878609 has 8 divisors (see below), whose sum is σ = 2223772352. Its totient is φ = 2150018640.

The previous prime is 2186878607. The next prime is 2186878613. The reversal of 2186878609 is 9068786812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2186878609 - 2¹ = 2186878607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2186878609.

It is not an unprimeable number, because it can be changed into a prime (2186878607) 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 7 ways as a sum of consecutive naturals, for example, 145522 + ... + 159844.

It is an arithmetic number, because the mean of its divisors is an integer number (277971544).

Almost surely, 2^2186878609 is an apocalyptic number.

It is an amenable number.

2186878609 is a deficient number, since it is larger than the sum of its proper divisors (36893743).

2186878609 is a wasteful number, since it uses less digits than its factorization.

2186878609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16887.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The square root of 2186878609 is about 46764.0739136359. The cubic root of 2186878609 is about 1298.0005969040. Note that the first 3 decimals are identical.

The spelling of 2186878609 in words is "two billion, one hundred eighty-six million, eight hundred seventy-eight thousand, six hundred nine".