609769 has 4 divisors (see below), whose sum is σ = 618196. Its totient is φ = 601344.

The previous prime is 609757. The next prime is 609779. The reversal of 609769 is 967906.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 967906 = 2 ⋅483953.

It can be written as a sum of positive squares in 2 ways, for example, as 374544 + 235225 = 612^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 609769 - 2⁷ = 609641 is a prime.

It is a super-2 number, since 2×609769² = 743636466722, which contains 22 as substring.

It is a Duffinian number.

609769 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609709) 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 3 ways as a sum of consecutive naturals, for example, 4104 + ... + 4249.

It is an arithmetic number, because the mean of its divisors is an integer number (154549).

2⁶⁰⁹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

609769 is a deficient number, since it is larger than the sum of its proper divisors (8427).

609769 is an equidigital number, since it uses as much as digits as its factorization.

609769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8426.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 609769 is about 780.8770709913. The cubic root of 609769 is about 84.7985541020.

It can be divided in two parts, 609 and 769, that added together give a triangular number (1378 = T₅₂).

The spelling of 609769 in words is "six hundred nine thousand, seven hundred sixty-nine".