138311839 has 2 divisors, whose sum is σ = 138311840. Its totient is φ = 138311838.

The previous prime is 138311687. The next prime is 138311851. The reversal of 138311839 is 938113831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138311839 - 2¹⁷ = 138180767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138311798 and 138311807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138311869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69155919 + 69155920.

It is an arithmetic number, because the mean of its divisors is an integer number (69155920).

Almost surely, 2^138311839 is an apocalyptic number.

138311839 is a deficient number, since it is larger than the sum of its proper divisors (1).

138311839 is an equidigital number, since it uses as much as digits as its factorization.

138311839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 138311839 is about 11760.6053840778. The cubic root of 138311839 is about 517.1538774776.

The spelling of 138311839 in words is "one hundred thirty-eight million, three hundred eleven thousand, eight hundred thirty-nine".