239989 has 8 divisors (see below), whose sum is σ = 267840. Its totient is φ = 213696.

The previous prime is 239977. The next prime is 239999. The reversal of 239989 is 989932.

239989 = 42² + 43² + ... + 92².

It is a happy number.

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 239989 - 2⁵ = 239957 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 (239929) 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, 49 + ... + 694.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2²³⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

239989 is a deficient number, since it is larger than the sum of its proper divisors (27851).

239989 is a wasteful number, since it uses less digits than its factorization.

239989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779.

The product of its digits is 34992, while the sum is 40.

The square root of 239989 is about 489.8867216000. The cubic root of 239989 is about 62.1437006724.

The spelling of 239989 in words is "two hundred thirty-nine thousand, nine hundred eighty-nine".