493921 has 4 divisors (see below), whose sum is σ = 497344. Its totient is φ = 490500.

The previous prime is 493919. The next prime is 493931. The reversal of 493921 is 129394.

It is a happy number.

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 493921 - 2¹ = 493919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 493921.

It is not an unprimeable number, because it can be changed into a prime (493931) 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, 1485 + ... + 1786.

It is an arithmetic number, because the mean of its divisors is an integer number (124336).

2⁴⁹³⁹²¹ is an apocalyptic number.

It is an amenable number.

493921 is a deficient number, since it is larger than the sum of its proper divisors (3423).

493921 is a wasteful number, since it uses less digits than its factorization.

493921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422.

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

The square root of 493921 is about 702.7951337339. The cubic root of 493921 is about 79.0470797727.

The spelling of 493921 in words is "four hundred ninety-three thousand, nine hundred twenty-one".