660439 has 8 divisors (see below), whose sum is σ = 719712. Its totient is φ = 602400.

The previous prime is 660409. The next prime is 660449. The reversal of 660439 is 934066.

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 660439 - 2¹¹ = 658391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660409) 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 7 ways as a sum of consecutive naturals, for example, 1062 + ... + 1564.

It is an arithmetic number, because the mean of its divisors is an integer number (89964).

2⁶⁶⁰⁴³⁹ is an apocalyptic number.

660439 is a deficient number, since it is larger than the sum of its proper divisors (59273).

660439 is a wasteful number, since it uses less digits than its factorization.

660439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 660439 is about 812.6739813726. The cubic root of 660439 is about 87.0851766333.

The spelling of 660439 in words is "six hundred sixty thousand, four hundred thirty-nine".