138436087 has 2 divisors, whose sum is σ = 138436088. Its totient is φ = 138436086.

The previous prime is 138436069. The next prime is 138436093. The reversal of 138436087 is 780634831.

138436087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (780634831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138436087 - 2²⁷ = 4218359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138436387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69218043 + 69218044.

It is an arithmetic number, because the mean of its divisors is an integer number (69218044).

Almost surely, 2^138436087 is an apocalyptic number.

138436087 is a deficient number, since it is larger than the sum of its proper divisors (1).

138436087 is an equidigital number, since it uses as much as digits as its factorization.

138436087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 138436087 is about 11765.8865794295. The cubic root of 138436087 is about 517.3086873248.

The spelling of 138436087 in words is "one hundred thirty-eight million, four hundred thirty-six thousand, eighty-seven".