646340 has 24 divisors (see below), whose sum is σ = 1437912. Its totient is φ = 243200.

The previous prime is 646339. The next prime is 646379. The reversal of 646340 is 43646.

646340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 31684 + 614656 = 178^2 + 784^2 .

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, 611 + ... + 1290.

It is an arithmetic number, because the mean of its divisors is an integer number (59913).

2⁶⁴⁶³⁴⁰ is an apocalyptic number.

It is an amenable number.

646340 is an abundant number, since it is smaller than the sum of its proper divisors (791572).

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

646340 is a wasteful number, since it uses less digits than its factorization.

646340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927 (or 1925 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 646340 is about 803.9527349291. The cubic root of 646340 is about 86.4610179970.

Adding to 646340 its reverse (43646), we get a palindrome (689986).

The spelling of 646340 in words is "six hundred forty-six thousand, three hundred forty".