493989 has 4 divisors (see below), whose sum is σ = 658656. Its totient is φ = 329324.

The previous prime is 493979. The next prime is 493993. The reversal of 493989 is 989394.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 493989 - 2⁴ = 493973 is a prime.

It is a D-number.

It is a Curzon number.

493989 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 493989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (493919) 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, 82329 + ... + 82334.

It is an arithmetic number, because the mean of its divisors is an integer number (164664).

2⁴⁹³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

493989 is a deficient number, since it is larger than the sum of its proper divisors (164667).

493989 is a wasteful number, since it uses less digits than its factorization.

493989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164666.

The product of its digits is 69984, while the sum is 42.

The square root of 493989 is about 702.8435103208. The cubic root of 493989 is about 79.0507071779.

The spelling of 493989 in words is "four hundred ninety-three thousand, nine hundred eighty-nine".