667439 has 8 divisors (see below), whose sum is σ = 696192. Its totient is φ = 639360.

The previous prime is 667427. The next prime is 667441. The reversal of 667439 is 934766.

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

It is a cyclic number.

It is not a de Polignac number, because 667439 - 2⁴ = 667423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667399 and 667408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2882 + ... + 3104.

It is an arithmetic number, because the mean of its divisors is an integer number (87024).

2⁶⁶⁷⁴³⁹ is an apocalyptic number.

667439 is a deficient number, since it is larger than the sum of its proper divisors (28753).

667439 is a wasteful number, since it uses less digits than its factorization.

667439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337.

The product of its digits is 27216, while the sum is 35.

The square root of 667439 is about 816.9693996717. The cubic root of 667439 is about 87.3917682204.

The spelling of 667439 in words is "six hundred sixty-seven thousand, four hundred thirty-nine".