818493 has 16 divisors (see below), whose sum is σ = 1214976. Its totient is φ = 486720.

The previous prime is 818473. The next prime is 818509. The reversal of 818493 is 394818.

It is not a de Polignac number, because 818493 - 2⁶ = 818429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871 + ... + 1547.

It is an arithmetic number, because the mean of its divisors is an integer number (75936).

2⁸¹⁸⁴⁹³ is an apocalyptic number.

It is an amenable number.

818493 is a deficient number, since it is larger than the sum of its proper divisors (396483).

818493 is a wasteful number, since it uses less digits than its factorization.

818493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724.

The product of its digits is 6912, while the sum is 33.

The square root of 818493 is about 904.7060296030. The cubic root of 818493 is about 93.5416421601.

The spelling of 818493 in words is "eight hundred eighteen thousand, four hundred ninety-three".