502391 has 4 divisors (see below), whose sum is σ = 504984. Its totient is φ = 499800.

The previous prime is 502339. The next prime is 502393. The reversal of 502391 is 193205.

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 502391 - 2¹⁰ = 501367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (502393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980 + ... + 1401.

It is an arithmetic number, because the mean of its divisors is an integer number (126246).

2⁵⁰²³⁹¹ is an apocalyptic number.

502391 is a deficient number, since it is larger than the sum of its proper divisors (2593).

502391 is a wasteful number, since it uses less digits than its factorization.

502391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 502391 is about 708.7954570961. The cubic root of 502391 is about 79.4963673300.

Adding to 502391 its reverse (193205), we get a palindrome (695596).

The spelling of 502391 in words is "five hundred two thousand, three hundred ninety-one".