646238 has 16 divisors (see below), whose sum is σ = 1043280. Its totient is φ = 299136.

The previous prime is 646237. The next prime is 646253. The reversal of 646238 is 832646.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 646238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2708 + ... + 2936.

It is an arithmetic number, because the mean of its divisors is an integer number (65205).

2⁶⁴⁶²³⁸ is an apocalyptic number.

646238 is a deficient number, since it is larger than the sum of its proper divisors (397042).

646238 is a wasteful number, since it uses less digits than its factorization.

646238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331.

The product of its digits is 6912, while the sum is 29.

The square root of 646238 is about 803.8892958611. The cubic root of 646238 is about 86.4564695716.

The spelling of 646238 in words is "six hundred forty-six thousand, two hundred thirty-eight".