667138 has 8 divisors (see below), whose sum is σ = 1044288. Its totient is φ = 319044.

The previous prime is 667129. The next prime is 667141. The reversal of 667138 is 831766.

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

It is a super-2 number, since 2×667138² = 890146222088, which contains 22 as substring.

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, 7206 + ... + 7297.

It is an arithmetic number, because the mean of its divisors is an integer number (130536).

2⁶⁶⁷¹³⁸ is an apocalyptic number.

667138 is a deficient number, since it is larger than the sum of its proper divisors (377150).

667138 is a wasteful number, since it uses less digits than its factorization.

667138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14528.

The product of its digits is 6048, while the sum is 31.

The square root of 667138 is about 816.7851614715. The cubic root of 667138 is about 87.3786290034.

The spelling of 667138 in words is "six hundred sixty-seven thousand, one hundred thirty-eight".