646932 has 72 divisors (see below), whose sum is σ = 1844640. Its totient is φ = 174720.

The previous prime is 646927. The next prime is 646937. The reversal of 646932 is 239646.

It is an interprime number because it is at equal distance from previous prime (646927) and next prime (646937).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 646932.

It is a congruent number.

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

646932 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 23 ways as a sum of consecutive naturals, for example, 22294 + ... + 22322.

It is an arithmetic number, because the mean of its divisors is an integer number (25620).

2⁶⁴⁶⁹³² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922320).

646932 is an abundant number, since it is smaller than the sum of its proper divisors (1197708).

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

646932 is a wasteful number, since it uses less digits than its factorization.

646932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 58 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 646932 is about 804.3208315094. The cubic root of 646932 is about 86.4874072572.

It can be divided in two parts, 64 and 6932, that added together give a palindrome (6996).

The spelling of 646932 in words is "six hundred forty-six thousand, nine hundred thirty-two".