646938 has 24 divisors (see below), whose sum is σ = 1417728. Its totient is φ = 213192.

The previous prime is 646937. The next prime is 646957. The reversal of 646938 is 839646.

646938 is a `hidden beast` number, since 646 + 9 + 3 + 8 = 666.

It is a d-powerful number, because it can be written as 6 + 4⁷ + 9⁶ + 6⁶ + 3⁹ + 8⁵ .

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646938.

It is not an unprimeable number, because it can be changed into a prime (646937) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2145 + ... + 2427.

It is an arithmetic number, because the mean of its divisors is an integer number (59072).

646938 is a Friedman number, since it can be written as 9*(8+66^3/4), using all its digits and the basic arithmetic operations.

2⁶⁴⁶⁹³⁸ is an apocalyptic number.

646938 is an abundant number, since it is smaller than the sum of its proper divisors (770790).

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

646938 is a wasteful number, since it uses less digits than its factorization.

646938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 415 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 646938 is about 804.3245613557. The cubic root of 646938 is about 86.4876746335.

The spelling of 646938 in words is "six hundred forty-six thousand, nine hundred thirty-eight".