493991 has 8 divisors (see below), whose sum is σ = 513264. Its totient is φ = 475200.

The previous prime is 493979. The next prime is 493993. The reversal of 493991 is 199394.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 493991 - 2¹⁰ = 492967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 493991.

It is not an unprimeable number, because it can be changed into a prime (493993) 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 7 ways as a sum of consecutive naturals, for example, 4841 + ... + 4941.

It is an arithmetic number, because the mean of its divisors is an integer number (64158).

2⁴⁹³⁹⁹¹ is an apocalyptic number.

493991 is a deficient number, since it is larger than the sum of its proper divisors (19273).

493991 is a wasteful number, since it uses less digits than its factorization.

493991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

The product of its digits is 8748, while the sum is 35.

The square root of 493991 is about 702.8449331111. The cubic root of 493991 is about 79.0508138612.

The spelling of 493991 in words is "four hundred ninety-three thousand, nine hundred ninety-one".