646926 has 32 divisors (see below), whose sum is σ = 1506048. Its totient is φ = 181440.

The previous prime is 646913. The next prime is 646927. The reversal of 646926 is 629646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2961 + ... + 3171.

It is an arithmetic number, because the mean of its divisors is an integer number (47064).

2⁶⁴⁶⁹²⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646926, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753024).

646926 is an abundant number, since it is smaller than the sum of its proper divisors (859122).

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

646926 is a wasteful number, since it uses less digits than its factorization.

646926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

The product of its digits is 15552, while the sum is 33.

The square root of 646926 is about 804.3171016459. The cubic root of 646926 is about 86.4871398793.

The spelling of 646926 in words is "six hundred forty-six thousand, nine hundred twenty-six".