138695287 has 2 divisors, whose sum is σ = 138695288. Its totient is φ = 138695286.

The previous prime is 138695281. The next prime is 138695317. The reversal of 138695287 is 782596831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138695287 - 2³ = 138695279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138695287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138695281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69347643 + 69347644.

It is an arithmetic number, because the mean of its divisors is an integer number (69347644).

Almost surely, 2^138695287 is an apocalyptic number.

138695287 is a deficient number, since it is larger than the sum of its proper divisors (1).

138695287 is an equidigital number, since it uses as much as digits as its factorization.

138695287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 138695287 is about 11776.8963228858. The cubic root of 138695287 is about 517.6313460003.

The spelling of 138695287 in words is "one hundred thirty-eight million, six hundred ninety-five thousand, two hundred eighty-seven".