492391 has 4 divisors (see below), whose sum is σ = 509400. Its totient is φ = 475384.

The previous prime is 492389. The next prime is 492397. The reversal of 492391 is 193294.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 492391 - 2¹ = 492389 is a prime.

It is a Duffinian number.

492391 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (492397) 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, 8461 + ... + 8518.

It is an arithmetic number, because the mean of its divisors is an integer number (127350).

2⁴⁹²³⁹¹ is an apocalyptic number.

492391 is a deficient number, since it is larger than the sum of its proper divisors (17009).

492391 is a wasteful number, since it uses less digits than its factorization.

492391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17008.

The product of its digits is 1944, while the sum is 28.

The square root of 492391 is about 701.7057787991. The cubic root of 492391 is about 78.9653749882.

The spelling of 492391 in words is "four hundred ninety-two thousand, three hundred ninety-one".