668941 has 8 divisors (see below), whose sum is σ = 823424. Its totient is φ = 529200.

The previous prime is 668939. The next prime is 668947. The reversal of 668941 is 149866.

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

It is not a de Polignac number, because 668941 - 2¹ = 668939 is a prime.

It is a super-2 number, since 2×668941² = 894964122962, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 668897 and 668906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668947) 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, 3585 + ... + 3766.

It is an arithmetic number, because the mean of its divisors is an integer number (102928).

2⁶⁶⁸⁹⁴¹ is an apocalyptic number.

It is an amenable number.

668941 is a deficient number, since it is larger than the sum of its proper divisors (154483).

668941 is a wasteful number, since it uses less digits than its factorization.

668941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7371.

The product of its digits is 10368, while the sum is 34.

The square root of 668941 is about 817.8881341602. Note that the first 3 decimals coincide. The cubic root of 668941 is about 87.4572743789.

The spelling of 668941 in words is "six hundred sixty-eight thousand, nine hundred forty-one".