492809 has 4 divisors (see below), whose sum is σ = 494340. Its totient is φ = 491280.

The previous prime is 492799. The next prime is 492839. The reversal of 492809 is 908294.

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 193600 + 299209 = 440^2 + 547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-492809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (492839) 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, 74 + ... + 995.

It is an arithmetic number, because the mean of its divisors is an integer number (123585).

2⁴⁹²⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

492809 is a deficient number, since it is larger than the sum of its proper divisors (1531).

492809 is a wasteful number, since it uses less digits than its factorization.

492809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 492809 is about 702.0035612445. The cubic root of 492809 is about 78.9877137332.

It can be divided in two parts, 49 and 2809, that multiplied together give a square (137641 = 371²).

The spelling of 492809 in words is "four hundred ninety-two thousand, eight hundred nine".