646353 has 16 divisors (see below), whose sum is σ = 984960. Its totient is φ = 418608.

The previous prime is 646339. The next prime is 646379. The reversal of 646353 is 353646.

It is not a de Polignac number, because 646353 - 2¹⁰ = 645329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

646353 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (646253) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 676 + ... + 1322.

It is an arithmetic number, because the mean of its divisors is an integer number (61560).

2⁶⁴⁶³⁵³ is an apocalyptic number.

It is an amenable number.

646353 is a deficient number, since it is larger than the sum of its proper divisors (338607).

646353 is a wasteful number, since it uses less digits than its factorization.

646353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 687 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 646353 is about 803.9608199409. The cubic root of 646353 is about 86.4615976639.

Adding to 646353 its reverse (353646), we get a palindrome (999999).

It can be divided in two parts, 646 and 353, that added together give a palindrome (999).

The spelling of 646353 in words is "six hundred forty-six thousand, three hundred fifty-three".