649443 has 4 divisors (see below), whose sum is σ = 865928. Its totient is φ = 432960.

The previous prime is 649427. The next prime is 649457. The reversal of 649443 is 344946.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 649443 - 2⁴ = 649427 is a prime.

It is a D-number.

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 649443.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649443.

It is not an unprimeable number, because it can be changed into a prime (649403) 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 3 ways as a sum of consecutive naturals, for example, 108238 + ... + 108243.

It is an arithmetic number, because the mean of its divisors is an integer number (216482).

2⁶⁴⁹⁴⁴³ is an apocalyptic number.

649443 is a deficient number, since it is larger than the sum of its proper divisors (216485).

649443 is a wasteful number, since it uses less digits than its factorization.

649443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216484.

The product of its digits is 10368, while the sum is 30.

The square root of 649443 is about 805.8802640591. The cubic root of 649443 is about 86.5991601204.

The spelling of 649443 in words is "six hundred forty-nine thousand, four hundred forty-three".