667938 has 8 divisors (see below), whose sum is σ = 1335888. Its totient is φ = 222644.

The previous prime is 667921. The next prime is 667949. The reversal of 667938 is 839766.

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

667938 is an admirable number.

It is a super-2 number, since 2×667938² = 892282343688, which contains 22 as substring.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 667896 and 667905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55656 + ... + 55667.

It is an arithmetic number, because the mean of its divisors is an integer number (166986).

2⁶⁶⁷⁹³⁸ is an apocalyptic number.

667938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667938 is a wasteful number, since it uses less digits than its factorization.

667938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111328.

The product of its digits is 54432, while the sum is 39.

The square root of 667938 is about 817.2747396072. The cubic root of 667938 is about 87.4135418102.

The spelling of 667938 in words is "six hundred sixty-seven thousand, nine hundred thirty-eight".