2009438605 has 4 divisors (see below), whose sum is σ = 2411326332. Its totient is φ = 1607550880.

The previous prime is 2009438603. The next prime is 2009438621. The reversal of 2009438605 is 5068349002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1026177156 + 983261449 = 32034^2 + 31357^2 .

It is not a de Polignac number, because 2009438605 - 2¹ = 2009438603 is a prime.

It is a super-3 number, since 3×2009438605³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009438603) 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, 200943856 + ... + 200943865.

It is an arithmetic number, because the mean of its divisors is an integer number (602831583).

Almost surely, 2^2009438605 is an apocalyptic number.

It is an amenable number.

2009438605 is a deficient number, since it is larger than the sum of its proper divisors (401887727).

2009438605 is an equidigital number, since it uses as much as digits as its factorization.

2009438605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401887726.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 2009438605 is about 44826.7621516433. The cubic root of 2009438605 is about 1261.8999230384.

The spelling of 2009438605 in words is "two billion, nine million, four hundred thirty-eight thousand, six hundred five".