229639 has 2 divisors, whose sum is σ = 229640. Its totient is φ = 229638.

The previous prime is 229637. The next prime is 229681. The reversal of 229639 is 936922.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 229639 - 2¹ = 229637 is a prime.

It is a super-3 number, since 3×229639³ = 36329397523332357, which contains 333 as substring.

Together with 229637, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 229639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229631) 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 as a sum of consecutive naturals, namely, 114819 + 114820.

It is an arithmetic number, because the mean of its divisors is an integer number (114820).

2²²⁹⁶³⁹ is an apocalyptic number.

229639 is a deficient number, since it is larger than the sum of its proper divisors (1).

229639 is an equidigital number, since it uses as much as digits as its factorization.

229639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 31.

The square root of 229639 is about 479.2066360142. The cubic root of 229639 is about 61.2371846019.

It can be divided in two parts, 229 and 639, that added together give a palindrome (868).

The spelling of 229639 in words is "two hundred twenty-nine thousand, six hundred thirty-nine".