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138239 is a prime number
BaseRepresentation
bin100001101111111111
321000121222
4201233333
513410424
62543555
71114013
oct415777
9230558
10138239
1194952
1267bbb
134abca
1438543
152ae5e
hex21bff

138239 has 2 divisors, whose sum is σ = 138240. Its totient is φ = 138238.

The previous prime is 138209. The next prime is 138241. The reversal of 138239 is 932831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138239 - 28 = 137983 is a prime.

It is a super-2 number, since 2×1382392 = 38220042242, which contains 22 as substring.

Together with 138241, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69119 + 69120.

It is an arithmetic number, because the mean of its divisors is an integer number (69120).

2138239 is an apocalyptic number.

138239 is a deficient number, since it is larger than the sum of its proper divisors (1).

138239 is an equidigital number, since it uses as much as digits as its factorization.

138239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 138239 is about 371.8050564476. The cubic root of 138239 is about 51.7063078825.

The spelling of 138239 in words is "one hundred thirty-eight thousand, two hundred thirty-nine".