138542329 has 2 divisors, whose sum is σ = 138542330. Its totient is φ = 138542328.

The previous prime is 138542311. The next prime is 138542347. The reversal of 138542329 is 923245831.

It is a balanced prime because it is at equal distance from previous prime (138542311) and next prime (138542347).

It can be written as a sum of positive squares in only one way, i.e., 124367104 + 14175225 = 11152^2 + 3765^2 .

It is a cyclic number.

It is not a de Polignac number, because 138542329 - 2²⁷ = 4324601 is a prime.

It is not a weakly prime, because it can be changed into another prime (138542359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69271164 + 69271165.

It is an arithmetic number, because the mean of its divisors is an integer number (69271165).

Almost surely, 2^138542329 is an apocalyptic number.

It is an amenable number.

138542329 is a deficient number, since it is larger than the sum of its proper divisors (1).

138542329 is an equidigital number, since it uses as much as digits as its factorization.

138542329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 138542329 is about 11770.4005454360. The cubic root of 138542329 is about 517.4409887047.

The spelling of 138542329 in words is "one hundred thirty-eight million, five hundred forty-two thousand, three hundred twenty-nine".