239961 has 4 divisors (see below), whose sum is σ = 319952. Its totient is φ = 159972.

The previous prime is 239957. The next prime is 239963. The reversal of 239961 is 169932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 239961 - 2² = 239957 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 239961.

It is not an unprimeable number, because it can be changed into a prime (239963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39991 + ... + 39996.

It is an arithmetic number, because the mean of its divisors is an integer number (79988).

2²³⁹⁹⁶¹ is an apocalyptic number.

It is an amenable number.

239961 is a deficient number, since it is larger than the sum of its proper divisors (79991).

239961 is an equidigital number, since it uses as much as digits as its factorization.

239961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79990.

The product of its digits is 2916, while the sum is 30.

The square root of 239961 is about 489.8581427311. The cubic root of 239961 is about 62.1412837682.

The spelling of 239961 in words is "two hundred thirty-nine thousand, nine hundred sixty-one".