660838 has 8 divisors (see below), whose sum is σ = 1015560. Its totient is φ = 322320.

The previous prime is 660833. The next prime is 660851. The reversal of 660838 is 838066.

660838 is nontrivially palindromic in base 15.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660833) by changing a digit.

660838 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3948 + ... + 4111.

It is an arithmetic number, because the mean of its divisors is an integer number (126945).

2⁶⁶⁰⁸³⁸ is an apocalyptic number.

660838 is a deficient number, since it is larger than the sum of its proper divisors (354722).

660838 is a wasteful number, since it uses less digits than its factorization.

660838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8102.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 660838 is about 812.9194302020. The cubic root of 660838 is about 87.1027104204.

The spelling of 660838 in words is "six hundred sixty thousand, eight hundred thirty-eight".