609857 has 4 divisors (see below), whose sum is σ = 614100. Its totient is φ = 605616.

The previous prime is 609821. The next prime is 609859. The reversal of 609857 is 758906.

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 152881 + 456976 = 391^2 + 676^2 .

It is a cyclic number.

It is not a de Polignac number, because 609857 - 2⁸ = 609601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609859) 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, 1898 + ... + 2195.

It is an arithmetic number, because the mean of its divisors is an integer number (153525).

2⁶⁰⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

609857 is a deficient number, since it is larger than the sum of its proper divisors (4243).

609857 is a wasteful number, since it uses less digits than its factorization.

609857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 609857 is about 780.9334158557. The cubic root of 609857 is about 84.8026331952.

The spelling of 609857 in words is "six hundred nine thousand, eight hundred fifty-seven".