1908009 has 8 divisors (see below), whose sum is σ = 2826720. Its totient is φ = 1271988.

The previous prime is 1907993. The next prime is 1908013. The reversal of 1908009 is 9008091.

It is not a de Polignac number, because 1908009 - 2⁴ = 1907993 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: 70667 = 1908009 / (1 + 9 + 0 + 8 + 0 + 0 + 9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1908089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35307 + ... + 35360.

It is an arithmetic number, because the mean of its divisors is an integer number (353340).

2^1908009 is an apocalyptic number.

It is an amenable number.

1908009 is a deficient number, since it is larger than the sum of its proper divisors (918711).

1908009 is an equidigital number, since it uses as much as digits as its factorization.

1908009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70676 (or 70670 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1908009 is about 1381.3069897745. The cubic root of 1908009 is about 124.0300178801.

The spelling of 1908009 in words is "one million, nine hundred eight thousand, nine".