138279983 has 2 divisors, whose sum is σ = 138279984. Its totient is φ = 138279982.

The previous prime is 138279949. The next prime is 138280039. The reversal of 138279983 is 389972831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138279983 - 2⁶ = 138279919 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138272983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69139991 + 69139992.

It is an arithmetic number, because the mean of its divisors is an integer number (69139992).

Almost surely, 2^138279983 is an apocalyptic number.

138279983 is a deficient number, since it is larger than the sum of its proper divisors (1).

138279983 is an equidigital number, since it uses as much as digits as its factorization.

138279983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The square root of 138279983 is about 11759.2509540361. The cubic root of 138279983 is about 517.1141707805.

The spelling of 138279983 in words is "one hundred thirty-eight million, two hundred seventy-nine thousand, nine hundred eighty-three".