648239 has 2 divisors, whose sum is σ = 648240. Its totient is φ = 648238.

The previous prime is 648229. The next prime is 648257. The reversal of 648239 is 932846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 648239 - 2¹² = 644143 is a prime.

It is a super-2 number, since 2×648239² = 840427602242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648229) 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 as a sum of consecutive naturals, namely, 324119 + 324120.

It is an arithmetic number, because the mean of its divisors is an integer number (324120).

2⁶⁴⁸²³⁹ is an apocalyptic number.

648239 is a deficient number, since it is larger than the sum of its proper divisors (1).

648239 is an equidigital number, since it uses as much as digits as its factorization.

648239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 648239 is about 805.1329082828. The cubic root of 648239 is about 86.5456117270.

The spelling of 648239 in words is "six hundred forty-eight thousand, two hundred thirty-nine".