138288739 has 2 divisors, whose sum is σ = 138288740. Its totient is φ = 138288738.

The previous prime is 138288691. The next prime is 138288751. The reversal of 138288739 is 937882831.

138288739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138288739 - 2⁷ = 138288611 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138288692 and 138288701.

It is not a weakly prime, because it can be changed into another prime (138288239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69144369 + 69144370.

It is an arithmetic number, because the mean of its divisors is an integer number (69144370).

Almost surely, 2^138288739 is an apocalyptic number.

138288739 is a deficient number, since it is larger than the sum of its proper divisors (1).

138288739 is an equidigital number, since it uses as much as digits as its factorization.

138288739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 49.

The square root of 138288739 is about 11759.6232507679. The cubic root of 138288739 is about 517.1250852456.

The spelling of 138288739 in words is "one hundred thirty-eight million, two hundred eighty-eight thousand, seven hundred thirty-nine".