138342859 has 2 divisors, whose sum is σ = 138342860. Its totient is φ = 138342858.

The previous prime is 138342851. The next prime is 138342871. The reversal of 138342859 is 958243831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138342859 - 2³ = 138342851 is a prime.

It is not a weakly prime, because it can be changed into another prime (138342851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69171429 + 69171430.

It is an arithmetic number, because the mean of its divisors is an integer number (69171430).

Almost surely, 2^138342859 is an apocalyptic number.

138342859 is a deficient number, since it is larger than the sum of its proper divisors (1).

138342859 is an equidigital number, since it uses as much as digits as its factorization.

138342859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The square root of 138342859 is about 11761.9241198028. The cubic root of 138342859 is about 517.1925362896.

The spelling of 138342859 in words is "one hundred thirty-eight million, three hundred forty-two thousand, eight hundred fifty-nine".