2018609 has 8 divisors (see below), whose sum is σ = 2099880. Its totient is φ = 1938816.

The previous prime is 2018593. The next prime is 2018623. The reversal of 2018609 is 9068102.

It can be written as a sum of positive squares in 4 ways, for example, as 16384 + 2002225 = 128^2 + 1415^2 .

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 2018609 - 2⁴ = 2018593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2018629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2987 + ... + 3599.

It is an arithmetic number, because the mean of its divisors is an integer number (262485).

2^2018609 is an apocalyptic number.

It is an amenable number.

2018609 is a deficient number, since it is larger than the sum of its proper divisors (81271).

2018609 is an equidigital number, since it uses as much as digits as its factorization.

2018609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 2018609 is about 1420.7776039902. Note that the first 3 decimals coincide. The cubic root of 2018609 is about 126.3816637732.

The spelling of 2018609 in words is "two million, eighteen thousand, six hundred nine".