239681 has 8 divisors (see below), whose sum is σ = 262080. Its totient is φ = 217872.

The previous prime is 239671. The next prime is 239689. The reversal of 239681 is 186932.

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 239681 - 2¹⁰ = 238657 is a prime.

It is a super-2 number, since 2×239681² = 114893963522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (239689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1250 + ... + 1428.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2²³⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

239681 is a deficient number, since it is larger than the sum of its proper divisors (22399).

239681 is a wasteful number, since it uses less digits than its factorization.

239681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295.

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

The square root of 239681 is about 489.5722622862. The cubic root of 239681 is about 62.1171043787.

The spelling of 239681 in words is "two hundred thirty-nine thousand, six hundred eighty-one".