138268379 has 2 divisors, whose sum is σ = 138268380. Its totient is φ = 138268378.

The previous prime is 138268367. The next prime is 138268391. The reversal of 138268379 is 973862831.

It is a balanced prime because it is at equal distance from previous prime (138268367) and next prime (138268391).

It is a cyclic number.

It is not a de Polignac number, because 138268379 - 2⁴ = 138268363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138268309) 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, 69134189 + 69134190.

It is an arithmetic number, because the mean of its divisors is an integer number (69134190).

Almost surely, 2^138268379 is an apocalyptic number.

138268379 is a deficient number, since it is larger than the sum of its proper divisors (1).

138268379 is an equidigital number, since it uses as much as digits as its factorization.

138268379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 47.

The square root of 138268379 is about 11758.7575449109. The cubic root of 138268379 is about 517.0997055375.

The spelling of 138268379 in words is "one hundred thirty-eight million, two hundred sixty-eight thousand, three hundred seventy-nine".