643246 has 8 divisors (see below), whose sum is σ = 1021680. Its totient is φ = 302688.

The previous prime is 643243. The next prime is 643273. The reversal of 643246 is 642346.

643246 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 643246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9426 + ... + 9493.

It is an arithmetic number, because the mean of its divisors is an integer number (127710).

2⁶⁴³²⁴⁶ is an apocalyptic number.

643246 is a deficient number, since it is larger than the sum of its proper divisors (378434).

643246 is a wasteful number, since it uses less digits than its factorization.

643246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18938.

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

The square root of 643246 is about 802.0261841112. The cubic root of 643246 is about 86.3228356256.

Subtracting from 643246 its reverse (642346), we obtain a square (900 = 30²).

The spelling of 643246 in words is "six hundred forty-three thousand, two hundred forty-six".