646206 has 16 divisors (see below), whose sum is σ = 1410048. Its totient is φ = 195800.

The previous prime is 646199. The next prime is 646237. The reversal of 646206 is 602646.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646206.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4830 + ... + 4961.

It is an arithmetic number, because the mean of its divisors is an integer number (88128).

2⁶⁴⁶²⁰⁶ is an apocalyptic number.

646206 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

646206 is an abundant number, since it is smaller than the sum of its proper divisors (763842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646206 is a wasteful number, since it uses less digits than its factorization.

646206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9807.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 646206 is about 803.8693923766. The cubic root of 646206 is about 86.4550425160.

The spelling of 646206 in words is "six hundred forty-six thousand, two hundred six".