648839 has 4 divisors (see below), whose sum is σ = 687024. Its totient is φ = 610656.

The previous prime is 648803. The next prime is 648841. The reversal of 648839 is 938846.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648859) 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, 19067 + ... + 19100.

It is an arithmetic number, because the mean of its divisors is an integer number (171756).

2⁶⁴⁸⁸³⁹ is an apocalyptic number.

648839 is a deficient number, since it is larger than the sum of its proper divisors (38185).

648839 is a wasteful number, since it uses less digits than its factorization.

648839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38184.

The product of its digits is 41472, while the sum is 38.

The square root of 648839 is about 805.5054313908. The cubic root of 648839 is about 86.5723052532.

The spelling of 648839 in words is "six hundred forty-eight thousand, eight hundred thirty-nine".