668039 has 6 divisors (see below), whose sum is σ = 684504. Its totient is φ = 651840.

The previous prime is 668033. The next prime is 668047. The reversal of 668039 is 930866.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-668039 is a prime.

It is a super-2 number, since 2×668039² = 892552211042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667996 and 668014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6839 + ... + 6935.

It is an arithmetic number, because the mean of its divisors is an integer number (114084).

2⁶⁶⁸⁰³⁹ is an apocalyptic number.

668039 is a deficient number, since it is larger than the sum of its proper divisors (16465).

668039 is an frugal number, since it uses more digits than its factorization.

668039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 668039 is about 817.3365279981. The cubic root of 668039 is about 87.4179475698.

The spelling of 668039 in words is "six hundred sixty-eight thousand, thirty-nine".