238639 has 2 divisors, whose sum is σ = 238640. Its totient is φ = 238638.

The previous prime is 238627. The next prime is 238649. The reversal of 238639 is 936832.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-238639 is a prime.

It is a super-3 number, since 3×238639³ = 40770451050333357, which contains 333 as substring.

It is a d-powerful number, because it can be written as 2⁵ + 3⁷ + 6³ + 8 + 3¹¹ + 9⁵ .

It is a self number, because there is not a number n which added to its sum of digits gives 238639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (238649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119319 + 119320.

It is an arithmetic number, because the mean of its divisors is an integer number (119320).

2²³⁸⁶³⁹ is an apocalyptic number.

238639 is a deficient number, since it is larger than the sum of its proper divisors (1).

238639 is an equidigital number, since it uses as much as digits as its factorization.

238639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 238639 is about 488.5069088560. The cubic root of 238639 is about 62.0269567136.

The spelling of 238639 in words is "two hundred thirty-eight thousand, six hundred thirty-nine".