667198 has 8 divisors (see below), whose sum is σ = 1143792. Its totient is φ = 285936.

The previous prime is 667181. The next prime is 667211. The reversal of 667198 is 891766.

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

It is a congruent number.

It is an unprimeable number.

667198 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 3 ways as a sum of consecutive naturals, for example, 23815 + ... + 23842.

It is an arithmetic number, because the mean of its divisors is an integer number (142974).

2⁶⁶⁷¹⁹⁸ is an apocalyptic number.

667198 is a deficient number, since it is larger than the sum of its proper divisors (476594).

667198 is a wasteful number, since it uses less digits than its factorization.

667198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47666.

The product of its digits is 18144, while the sum is 37.

The square root of 667198 is about 816.8218900103. The cubic root of 667198 is about 87.3812484317.

The spelling of 667198 in words is "six hundred sixty-seven thousand, one hundred ninety-eight".