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BaseRepresentation
bin10000011110100…
…11110111000111
3100122002212121112
420033103313013
5240341344424
621414435235
73265642346
oct1017236707
9318085545
10138231239
11710341a3
123a362b1b
132283b243
1414503b5d
15c20760e
hex83d3dc7

138231239 has 2 divisors, whose sum is σ = 138231240. Its totient is φ = 138231238.

The previous prime is 138231229. The next prime is 138231319. The reversal of 138231239 is 932132831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-138231239 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138231229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69115619 + 69115620.

It is an arithmetic number, because the mean of its divisors is an integer number (69115620).

Almost surely, 2138231239 is an apocalyptic number.

138231239 is a deficient number, since it is larger than the sum of its proper divisors (1).

138231239 is an equidigital number, since it uses as much as digits as its factorization.

138231239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 138231239 is about 11757.1781903652. The cubic root of 138231239 is about 517.0534023431.

The spelling of 138231239 in words is "one hundred thirty-eight million, two hundred thirty-one thousand, two hundred thirty-nine".