643294 has 4 divisors (see below), whose sum is σ = 964944. Its totient is φ = 321646.

The previous prime is 643273. The next prime is 643301. The reversal of 643294 is 492346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 492346 = 2 ⋅246173.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁶ + 4 + 2¹¹ + 3¹² + 9⁵ + 4⁶ .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 160822 + ... + 160825.

It is an arithmetic number, because the mean of its divisors is an integer number (241236).

2⁶⁴³²⁹⁴ is an apocalyptic number.

643294 is a deficient number, since it is larger than the sum of its proper divisors (321650).

643294 is a wasteful number, since it uses less digits than its factorization.

643294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321649.

The product of its digits is 5184, while the sum is 28.

The square root of 643294 is about 802.0561077630. The cubic root of 643294 is about 86.3249827528.

The spelling of 643294 in words is "six hundred forty-three thousand, two hundred ninety-four".