648138 has 8 divisors (see below), whose sum is σ = 1296288. Its totient is φ = 216044.

The previous prime is 648133. The next prime is 648173. The reversal of 648138 is 831846.

It is a happy number.

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

648138 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (648133) 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, 54006 + ... + 54017.

It is an arithmetic number, because the mean of its divisors is an integer number (162036).

2⁶⁴⁸¹³⁸ is an apocalyptic number.

648138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648138 is a wasteful number, since it uses less digits than its factorization.

648138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108028.

The product of its digits is 4608, while the sum is 30.

The square root of 648138 is about 805.0701832760. The cubic root of 648138 is about 86.5411166973.

The spelling of 648138 in words is "six hundred forty-eight thousand, one hundred thirty-eight".