239997 has 4 divisors (see below), whose sum is σ = 320000. Its totient is φ = 159996.

The previous prime is 239977. The next prime is 239999. The reversal of 239997 is 799932.

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 not a de Polignac number, because 239997 - 2⁶ = 239933 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39997 + ... + 40002.

It is an arithmetic number, because the mean of its divisors is an integer number (80000).

2²³⁹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

239997 is a deficient number, since it is larger than the sum of its proper divisors (80003).

239997 is an equidigital number, since it uses as much as digits as its factorization.

239997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80002.

The product of its digits is 30618, while the sum is 39.

The square root of 239997 is about 489.8948866849. The cubic root of 239997 is about 62.1443911820.

The spelling of 239997 in words is "two hundred thirty-nine thousand, nine hundred ninety-seven".