646743 has 8 divisors (see below), whose sum is σ = 867568. Its totient is φ = 428544.

The previous prime is 646721. The next prime is 646757. The reversal of 646743 is 347646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 646743 - 2¹⁸ = 384599 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 646743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21 + ... + 1137.

It is an arithmetic number, because the mean of its divisors is an integer number (108446).

2⁶⁴⁶⁷⁴³ is an apocalyptic number.

646743 is a deficient number, since it is larger than the sum of its proper divisors (220825).

646743 is a wasteful number, since it uses less digits than its factorization.

646743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313.

The product of its digits is 12096, while the sum is 30.

The square root of 646743 is about 804.2033324974. The cubic root of 646743 is about 86.4789840576.

The spelling of 646743 in words is "six hundred forty-six thousand, seven hundred forty-three".