138210287 has 2 divisors, whose sum is σ = 138210288. Its totient is φ = 138210286.

The previous prime is 138210283. The next prime is 138210337. The reversal of 138210287 is 782012831.

It is a weak prime.

It is an emirp because it is prime and its reverse (782012831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138210287 - 2² = 138210283 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138210283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69105143 + 69105144.

It is an arithmetic number, because the mean of its divisors is an integer number (69105144).

Almost surely, 2^138210287 is an apocalyptic number.

138210287 is a deficient number, since it is larger than the sum of its proper divisors (1).

138210287 is an equidigital number, since it uses as much as digits as its factorization.

138210287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 138210287 is about 11756.2871264698. The cubic root of 138210287 is about 517.0272773988.

The spelling of 138210287 in words is "one hundred thirty-eight million, two hundred ten thousand, two hundred eighty-seven".