239431 has 2 divisors, whose sum is σ = 239432. Its totient is φ = 239430.

The previous prime is 239429. The next prime is 239441. The reversal of 239431 is 134932.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 239431 - 2¹ = 239429 is a prime.

It is a super-2 number, since 2×239431² = 114654407522, which contains 22 as substring.

Together with 239429, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239441) 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 as a sum of consecutive naturals, namely, 119715 + 119716.

It is an arithmetic number, because the mean of its divisors is an integer number (119716).

2²³⁹⁴³¹ is an apocalyptic number.

239431 is a deficient number, since it is larger than the sum of its proper divisors (1).

239431 is an equidigital number, since it uses as much as digits as its factorization.

239431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 22.

The square root of 239431 is about 489.3168707494. The cubic root of 239431 is about 62.0954997201.

The spelling of 239431 in words is "two hundred thirty-nine thousand, four hundred thirty-one".