646243 has 4 divisors (see below), whose sum is σ = 695968. Its totient is φ = 596520.

The previous prime is 646237. The next prime is 646253. The reversal of 646243 is 342646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646243 - 2¹³ = 638051 is a prime.

It is a d-powerful number, because it can be written as 6⁷ + 4⁵ + 2⁷ + 6⁷ + 4⁸ + 3⁹ .

It is not an unprimeable number, because it can be changed into a prime (646253) 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, 24843 + ... + 24868.

It is an arithmetic number, because the mean of its divisors is an integer number (173992).

2⁶⁴⁶²⁴³ is an apocalyptic number.

646243 is a deficient number, since it is larger than the sum of its proper divisors (49725).

646243 is a wasteful number, since it uses less digits than its factorization.

646243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49724.

The product of its digits is 3456, while the sum is 25.

The square root of 646243 is about 803.8924057360. The cubic root of 646243 is about 86.4566925448.

Adding to 646243 its reverse (342646), we get a palindrome (988889).

The spelling of 646243 in words is "six hundred forty-six thousand, two hundred forty-three".