138863827 has 2 divisors, whose sum is σ = 138863828. Its totient is φ = 138863826.

The previous prime is 138863807. The next prime is 138863839. The reversal of 138863827 is 728368831.

It is a strong prime.

It is an emirp because it is prime and its reverse (728368831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138863827 - 2²⁷ = 4646099 is a prime.

It is not a weakly prime, because it can be changed into another prime (138863807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69431913 + 69431914.

It is an arithmetic number, because the mean of its divisors is an integer number (69431914).

Almost surely, 2^138863827 is an apocalyptic number.

138863827 is a deficient number, since it is larger than the sum of its proper divisors (1).

138863827 is an equidigital number, since it uses as much as digits as its factorization.

138863827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 138863827 is about 11784.0496859102. The cubic root of 138863827 is about 517.8409332055.

The spelling of 138863827 in words is "one hundred thirty-eight million, eight hundred sixty-three thousand, eight hundred twenty-seven".