138066289 has 4 divisors (see below), whose sum is σ = 138430960. Its totient is φ = 137701620.

The previous prime is 138066251. The next prime is 138066301. The reversal of 138066289 is 982660831.

138066289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 138066289 - 2⁹ = 138065777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138066689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181767 + ... + 182524.

It is an arithmetic number, because the mean of its divisors is an integer number (34607740).

Almost surely, 2^138066289 is an apocalyptic number.

It is an amenable number.

138066289 is a deficient number, since it is larger than the sum of its proper divisors (364671).

138066289 is an equidigital number, since it uses as much as digits as its factorization.

138066289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364670.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 138066289 is about 11750.1612329363. The cubic root of 138066289 is about 516.8476555422.

The spelling of 138066289 in words is "one hundred thirty-eight million, sixty-six thousand, two hundred eighty-nine".