138926087 has 2 divisors, whose sum is σ = 138926088. Its totient is φ = 138926086.

The previous prime is 138926071. The next prime is 138926089. The reversal of 138926087 is 780629831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138926087 - 2⁴ = 138926071 is a prime.

Together with 138926089, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138926089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69463043 + 69463044.

It is an arithmetic number, because the mean of its divisors is an integer number (69463044).

Almost surely, 2^138926087 is an apocalyptic number.

138926087 is a deficient number, since it is larger than the sum of its proper divisors (1).

138926087 is an equidigital number, since it uses as much as digits as its factorization.

138926087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 138926087 is about 11786.6910963171. The cubic root of 138926087 is about 517.9183134708.

The spelling of 138926087 in words is "one hundred thirty-eight million, nine hundred twenty-six thousand, eighty-seven".