667842 has 16 divisors (see below), whose sum is σ = 1526592. Its totient is φ = 190800.

The previous prime is 667837. The next prime is 667859. The reversal of 667842 is 248766.

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 7 ways as a sum of consecutive naturals, for example, 7909 + ... + 7992.

It is an arithmetic number, because the mean of its divisors is an integer number (95412).

2⁶⁶⁷⁸⁴² is an apocalyptic number.

667842 is an abundant number, since it is smaller than the sum of its proper divisors (858750).

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

667842 is a wasteful number, since it uses less digits than its factorization.

667842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15913.

The product of its digits is 16128, while the sum is 33.

The square root of 667842 is about 817.2160057170. The cubic root of 667842 is about 87.4093537458.

The spelling of 667842 in words is "six hundred sixty-seven thousand, eight hundred forty-two".