138186739 has 2 divisors, whose sum is σ = 138186740. Its totient is φ = 138186738.

The previous prime is 138186733. The next prime is 138186743. The reversal of 138186739 is 937681831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138186739 - 2⁵ = 138186707 is a prime.

It is not a weakly prime, because it can be changed into another prime (138186733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69093369 + 69093370.

It is an arithmetic number, because the mean of its divisors is an integer number (69093370).

Almost surely, 2^138186739 is an apocalyptic number.

138186739 is a deficient number, since it is larger than the sum of its proper divisors (1).

138186739 is an equidigital number, since it uses as much as digits as its factorization.

138186739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 138186739 is about 11755.2855771351. The cubic root of 138186739 is about 516.9979123636.

The spelling of 138186739 in words is "one hundred thirty-eight million, one hundred eighty-six thousand, seven hundred thirty-nine".