239689 has 2 divisors, whose sum is σ = 239690. Its totient is φ = 239688.

The previous prime is 239671. The next prime is 239699. The reversal of 239689 is 986932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233289 + 6400 = 483^2 + 80^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-239689 is a prime.

It is not a weakly prime, because it can be changed into another prime (239699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119844 + 119845.

It is an arithmetic number, because the mean of its divisors is an integer number (119845).

2²³⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

239689 is a deficient number, since it is larger than the sum of its proper divisors (1).

239689 is an equidigital number, since it uses as much as digits as its factorization.

239689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 239689 is about 489.5804326155. The cubic root of 239689 is about 62.1177954797.

It can be divided in two parts, 2396 and 89, that added together give a triangular number (2485 = T₇₀).

The spelling of 239689 in words is "two hundred thirty-nine thousand, six hundred eighty-nine".