646723 has 16 divisors (see below), whose sum is σ = 831744. Its totient is φ = 488160.

The previous prime is 646721. The next prime is 646757. The reversal of 646723 is 327646.

It is a cyclic number.

It is not a de Polignac number, because 646723 - 2¹ = 646721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646691 and 646700.

It is not an unprimeable number, because it can be changed into a prime (646721) 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, 2736 + ... + 2962.

It is an arithmetic number, because the mean of its divisors is an integer number (51984).

2⁶⁴⁶⁷²³ is an apocalyptic number.

646723 is a deficient number, since it is larger than the sum of its proper divisors (185021).

646723 is a wasteful number, since it uses less digits than its factorization.

646723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282.

The product of its digits is 6048, while the sum is 28.

The square root of 646723 is about 804.1908977351. The cubic root of 646723 is about 86.4780926178.

It can be divided in two parts, 646 and 723, that added together give a square (1369 = 37²).

The spelling of 646723 in words is "six hundred forty-six thousand, seven hundred twenty-three".