2009018939 has 4 divisors (see below), whose sum is σ = 2009245224. Its totient is φ = 2008792656.

The previous prime is 2009018929. The next prime is 2009018951. The reversal of 2009018939 is 9398109002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2009018939 - 2⁴ = 2009018923 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2009018896 and 2009018905.

It is not an unprimeable number, because it can be changed into a prime (2009018929) 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, 99257 + ... + 117770.

It is an arithmetic number, because the mean of its divisors is an integer number (502311306).

Almost surely, 2^2009018939 is an apocalyptic number.

2009018939 is a deficient number, since it is larger than the sum of its proper divisors (226285).

2009018939 is an equidigital number, since it uses as much as digits as its factorization.

2009018939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226284.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 2009018939 is about 44822.0809311661. The cubic root of 2009018939 is about 1261.8120687553.

The spelling of 2009018939 in words is "two billion, nine million, eighteen thousand, nine hundred thirty-nine".