646793 has 4 divisors (see below), whose sum is σ = 739200. Its totient is φ = 554388.

The previous prime is 646781. The next prime is 646823. The reversal of 646793 is 397646.

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, and also an emirpimes, since its reverse is a distinct semiprime: 397646 = 2 ⋅198823.

It is a cyclic number.

It is not a de Polignac number, because 646793 - 2⁸ = 646537 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (646193) 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, 46193 + ... + 46206.

It is an arithmetic number, because the mean of its divisors is an integer number (184800).

2⁶⁴⁶⁷⁹³ is an apocalyptic number.

It is an amenable number.

646793 is a deficient number, since it is larger than the sum of its proper divisors (92407).

646793 is an equidigital number, since it uses as much as digits as its factorization.

646793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92406.

The product of its digits is 27216, while the sum is 35.

The square root of 646793 is about 804.2344185622. The cubic root of 646793 is about 86.4812125769.

The spelling of 646793 in words is "six hundred forty-six thousand, seven hundred ninety-three".