609806 has 4 divisors (see below), whose sum is σ = 914712. Its totient is φ = 304902.

The previous prime is 609803. The next prime is 609809. The reversal of 609806 is 608906.

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

It is an interprime number because it is at equal distance from previous prime (609803) and next prime (609809).

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 609806.

It is not an unprimeable number, because it can be changed into a prime (609803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152450 + ... + 152453.

It is an arithmetic number, because the mean of its divisors is an integer number (228678).

2⁶⁰⁹⁸⁰⁶ is an apocalyptic number.

609806 is a deficient number, since it is larger than the sum of its proper divisors (304906).

609806 is a wasteful number, since it uses less digits than its factorization.

609806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304905.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 609806 is about 780.9007619410. The cubic root of 609806 is about 84.8002692231.

Subtracting from 609806 its reverse (608906), we obtain a square (900 = 30²).

The spelling of 609806 in words is "six hundred nine thousand, eight hundred six".