138689627 has 2 divisors, whose sum is σ = 138689628. Its totient is φ = 138689626.

The previous prime is 138689623. The next prime is 138689633. The reversal of 138689627 is 726986831.

It is a weak prime.

It is an emirp because it is prime and its reverse (726986831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138689627 - 2² = 138689623 is a prime.

It is not a weakly prime, because it can be changed into another prime (138689623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69344813 + 69344814.

It is an arithmetic number, because the mean of its divisors is an integer number (69344814).

Almost surely, 2^138689627 is an apocalyptic number.

138689627 is a deficient number, since it is larger than the sum of its proper divisors (1).

138689627 is an equidigital number, since it uses as much as digits as its factorization.

138689627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 138689627 is about 11776.6560194310. The cubic root of 138689627 is about 517.6243045852.

The spelling of 138689627 in words is "one hundred thirty-eight million, six hundred eighty-nine thousand, six hundred twenty-seven".