648438 has 16 divisors (see below), whose sum is σ = 1482240. Its totient is φ = 185256.

The previous prime is 648437. The next prime is 648449. The reversal of 648438 is 834846.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 648399 and 648408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7678 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (92640).

2⁶⁴⁸⁴³⁸ is an apocalyptic number.

648438 is an abundant number, since it is smaller than the sum of its proper divisors (833802).

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

648438 is a wasteful number, since it uses less digits than its factorization.

648438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15451.

The product of its digits is 18432, while the sum is 33.

The square root of 648438 is about 805.2564808805. The cubic root of 648438 is about 86.5544669048.

The spelling of 648438 in words is "six hundred forty-eight thousand, four hundred thirty-eight".