493821 has 6 divisors (see below), whose sum is σ = 713310. Its totient is φ = 329208.

The previous prime is 493817. The next prime is 493853. The reversal of 493821 is 128394.

It can be written as a sum of positive squares in only one way, i.e., 324900 + 168921 = 570^2 + 411^2 .

It is not a de Polignac number, because 493821 - 2² = 493817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (493811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27426 + ... + 27443.

It is an arithmetic number, because the mean of its divisors is an integer number (118885).

2⁴⁹³⁸²¹ is an apocalyptic number.

It is an amenable number.

493821 is a deficient number, since it is larger than the sum of its proper divisors (219489).

493821 is a wasteful number, since it uses less digits than its factorization.

493821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54875 (or 54872 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 493821 is about 702.7239856444. The cubic root of 493821 is about 79.0417447485.

The spelling of 493821 in words is "four hundred ninety-three thousand, eight hundred twenty-one".