239661 has 12 divisors (see below), whose sum is σ = 357760. Its totient is φ = 154440.

The previous prime is 239641. The next prime is 239671. The reversal of 239661 is 166932.

It is a happy number.

239661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 239661 - 2⁶ = 239597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 239661.

It is not an unprimeable number, because it can be changed into a prime (239611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151 + ... + 708.

2²³⁹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

239661 is a deficient number, since it is larger than the sum of its proper divisors (118099).

239661 is a wasteful number, since it uses less digits than its factorization.

239661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896 (or 893 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 239661 is about 489.5518358662. The cubic root of 239661 is about 62.1153765590.

It can be divided in two parts, 239 and 661, that added together give a square (900 = 30²).

The spelling of 239661 in words is "two hundred thirty-nine thousand, six hundred sixty-one".