667539 has 12 divisors (see below), whose sum is σ = 1021176. Its totient is φ = 418752.

The previous prime is 667531. The next prime is 667547. The reversal of 667539 is 935766.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (667531) and next prime (667547).

It is not a de Polignac number, because 667539 - 2³ = 667531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667531) 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 11 ways as a sum of consecutive naturals, for example, 2029 + ... + 2334.

It is an arithmetic number, because the mean of its divisors is an integer number (85098).

2⁶⁶⁷⁵³⁹ is an apocalyptic number.

667539 is a deficient number, since it is larger than the sum of its proper divisors (353637).

667539 is a wasteful number, since it uses less digits than its factorization.

667539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4386 (or 4383 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 667539 is about 817.0305991822. The cubic root of 667539 is about 87.3961325345.

The spelling of 667539 in words is "six hundred sixty-seven thousand, five hundred thirty-nine".