239861 has 4 divisors (see below), whose sum is σ = 241824. Its totient is φ = 237900.

The previous prime is 239857. The next prime is 239873. The reversal of 239861 is 168932.

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 a cyclic number.

It is not a de Polignac number, because 239861 - 2² = 239857 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 239861.

It is not an unprimeable number, because it can be changed into a prime (239831) 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 3 ways as a sum of consecutive naturals, for example, 785 + ... + 1046.

It is an arithmetic number, because the mean of its divisors is an integer number (60456).

2²³⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

239861 is a deficient number, since it is larger than the sum of its proper divisors (1963).

239861 is a wasteful number, since it uses less digits than its factorization.

239861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1962.

The product of its digits is 2592, while the sum is 29.

The square root of 239861 is about 489.7560617287. The cubic root of 239861 is about 62.1326504322.

The spelling of 239861 in words is "two hundred thirty-nine thousand, eight hundred sixty-one".