439661 has 2 divisors, whose sum is σ = 439662. Its totient is φ = 439660.

The previous prime is 439639. The next prime is 439667. The reversal of 439661 is 166934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 422500 + 17161 = 650^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 439661 - 2¹⁰ = 438637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219830 + 219831.

It is an arithmetic number, because the mean of its divisors is an integer number (219831).

2⁴³⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

439661 is a deficient number, since it is larger than the sum of its proper divisors (1).

439661 is an equidigital number, since it uses as much as digits as its factorization.

439661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 439661 is about 663.0693779689. The cubic root of 439661 is about 76.0395108498.

The spelling of 439661 in words is "four hundred thirty-nine thousand, six hundred sixty-one".