660347 has 2 divisors, whose sum is σ = 660348. Its totient is φ = 660346.

The previous prime is 660337. The next prime is 660349. The reversal of 660347 is 743066.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660347 is a prime.

Together with 660349, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₅₃₅₉₄ and since 660347 and 53594 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (660349) 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 as a sum of consecutive naturals, namely, 330173 + 330174.

It is an arithmetic number, because the mean of its divisors is an integer number (330174).

2⁶⁶⁰³⁴⁷ is an apocalyptic number.

660347 is a deficient number, since it is larger than the sum of its proper divisors (1).

660347 is an equidigital number, since it uses as much as digits as its factorization.

660347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 660347 is about 812.6173761371. The cubic root of 660347 is about 87.0811327532.

The spelling of 660347 in words is "six hundred sixty thousand, three hundred forty-seven".