2118609 has 8 divisors (see below), whose sum is σ = 3138720. Its totient is φ = 1412388.

The previous prime is 2118601. The next prime is 2118629. The reversal of 2118609 is 9068112.

It is not a de Polignac number, because 2118609 - 2³ = 2118601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 78467 = 2118609 / (2 + 1 + 1 + 8 + 6 + 0 + 9).

It is not an unprimeable number, because it can be changed into a prime (2118601) 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, 39207 + ... + 39260.

It is an arithmetic number, because the mean of its divisors is an integer number (392340).

2^2118609 is an apocalyptic number.

It is an amenable number.

2118609 is a deficient number, since it is larger than the sum of its proper divisors (1020111).

2118609 is an equidigital number, since it uses as much as digits as its factorization.

2118609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78476 (or 78470 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 2118609 is about 1455.5442281154. The cubic root of 2118609 is about 128.4350633562.

The spelling of 2118609 in words is "two million, one hundred eighteen thousand, six hundred nine".