239993 has 4 divisors (see below), whose sum is σ = 258468. Its totient is φ = 221520.

The previous prime is 239977. The next prime is 239999. The reversal of 239993 is 399932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21904 + 218089 = 148^2 + 467^2 .

It is not a de Polignac number, because 239993 - 2⁴ = 239977 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (239999) 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, 9218 + ... + 9243.

It is an arithmetic number, because the mean of its divisors is an integer number (64617).

2²³⁹⁹⁹³ is an apocalyptic number.

It is an amenable number.

239993 is a deficient number, since it is larger than the sum of its proper divisors (18475).

239993 is a wasteful number, since it uses less digits than its factorization.

239993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18474.

The product of its digits is 13122, while the sum is 35.

The square root of 239993 is about 489.8908041595. The cubic root of 239993 is about 62.1440459291.

The spelling of 239993 in words is "two hundred thirty-nine thousand, nine hundred ninety-three".