648389 has 4 divisors (see below), whose sum is σ = 741024. Its totient is φ = 555756.

The previous prime is 648383. The next prime is 648391. The reversal of 648389 is 983846.

648389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 983846 = 2 ⋅491923.

It is a cyclic number.

It is not a de Polignac number, because 648389 - 2⁸ = 648133 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 (648383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46307 + ... + 46320.

It is an arithmetic number, because the mean of its divisors is an integer number (185256).

2⁶⁴⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

648389 is a deficient number, since it is larger than the sum of its proper divisors (92635).

648389 is an equidigital number, since it uses as much as digits as its factorization.

648389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92634.

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

The square root of 648389 is about 805.2260552168. The cubic root of 648389 is about 86.5522866523.

The spelling of 648389 in words is "six hundred forty-eight thousand, three hundred eighty-nine".