493981 has 4 divisors (see below), whose sum is σ = 520000. Its totient is φ = 467964.

The previous prime is 493979. The next prime is 493993. The reversal of 493981 is 189394.

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 493981 - 2¹ = 493979 is a prime.

It is a super-2 number, since 2×493981² = 488034456722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (493931) 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, 12981 + ... + 13018.

It is an arithmetic number, because the mean of its divisors is an integer number (130000).

2⁴⁹³⁹⁸¹ is an apocalyptic number.

It is an amenable number.

493981 is a deficient number, since it is larger than the sum of its proper divisors (26019).

493981 is a wasteful number, since it uses less digits than its factorization.

493981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26018.

The product of its digits is 7776, while the sum is 34.

The square root of 493981 is about 702.8378191304. The cubic root of 493981 is about 79.0502804416.

The spelling of 493981 in words is "four hundred ninety-three thousand, nine hundred eighty-one".