666238 has 8 divisors (see below), whose sum is σ = 1005480. Its totient is φ = 331080.

The previous prime is 666233. The next prime is 666269. The reversal of 666238 is 832666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666233) 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 in 3 ways as a sum of consecutive naturals, for example, 573 + ... + 1288.

It is an arithmetic number, because the mean of its divisors is an integer number (125685).

2⁶⁶⁶²³⁸ is an apocalyptic number.

666238 is a deficient number, since it is larger than the sum of its proper divisors (339242).

666238 is a wasteful number, since it uses less digits than its factorization.

666238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042.

The product of its digits is 10368, while the sum is 31.

The square root of 666238 is about 816.2340350659. The cubic root of 666238 is about 87.3393187178.

The spelling of 666238 in words is "six hundred sixty-six thousand, two hundred thirty-eight".