138617863 has 6 divisors (see below), whose sum is σ = 146297904. Its totient is φ = 131321844.

The previous prime is 138617861. The next prime is 138617867. The reversal of 138617863 is 368716831.

It is not a de Polignac number, because 138617863 - 2¹ = 138617861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138617861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 191631 + ... + 192352.

It is an arithmetic number, because the mean of its divisors is an integer number (24382984).

Almost surely, 2^138617863 is an apocalyptic number.

138617863 is a deficient number, since it is larger than the sum of its proper divisors (7680041).

138617863 is an equidigital number, since it uses as much as digits as its factorization.

138617863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384021 (or 384002 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 138617863 is about 11773.6087500817. The cubic root of 138617863 is about 517.5350087948.

The spelling of 138617863 in words is "one hundred thirty-eight million, six hundred seventeen thousand, eight hundred sixty-three".