138407089 has 2 divisors, whose sum is σ = 138407090. Its totient is φ = 138407088.

The previous prime is 138407083. The next prime is 138407099. The reversal of 138407089 is 980704831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102010000 + 36397089 = 10100^2 + 6033^2 .

It is a cyclic number.

It is not a de Polignac number, because 138407089 - 2⁹ = 138406577 is a prime.

It is a Chen prime.

It is equal to p_7827169 and since 138407089 and 7827169 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138407083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69203544 + 69203545.

It is an arithmetic number, because the mean of its divisors is an integer number (69203545).

Almost surely, 2^138407089 is an apocalyptic number.

It is an amenable number.

138407089 is a deficient number, since it is larger than the sum of its proper divisors (1).

138407089 is an equidigital number, since it uses as much as digits as its factorization.

138407089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 138407089 is about 11764.6542235631. The cubic root of 138407089 is about 517.2725648437.

The spelling of 138407089 in words is "one hundred thirty-eight million, four hundred seven thousand, eighty-nine".