609840709 has 4 divisors (see below), whose sum is σ = 610511040. Its totient is φ = 609170380.

The previous prime is 609840691. The next prime is 609840713. The reversal of 609840709 is 907048906.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 609840709 - 2⁹ = 609840197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609840769) 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, 333799 + ... + 335620.

It is an arithmetic number, because the mean of its divisors is an integer number (152627760).

Almost surely, 2^609840709 is an apocalyptic number.

It is an amenable number.

609840709 is a deficient number, since it is larger than the sum of its proper divisors (670331).

609840709 is an equidigital number, since it uses as much as digits as its factorization.

609840709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670330.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 609840709 is about 24694.9531078721. The cubic root of 609840709 is about 848.0187808266.

It can be divided in two parts, 60 and 9840709, that added together give a square (9840769 = 3137²).

The spelling of 609840709 in words is "six hundred nine million, eight hundred forty thousand, seven hundred nine".