138698377 has 2 divisors, whose sum is σ = 138698378. Its totient is φ = 138698376.

The previous prime is 138698369. The next prime is 138698411. The reversal of 138698377 is 773896831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137100681 + 1597696 = 11709^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 138698377 - 2³ = 138698369 is a prime.

It is not a weakly prime, because it can be changed into another prime (138698317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69349188 + 69349189.

It is an arithmetic number, because the mean of its divisors is an integer number (69349189).

Almost surely, 2^138698377 is an apocalyptic number.

It is an amenable number.

138698377 is a deficient number, since it is larger than the sum of its proper divisors (1).

138698377 is an equidigital number, since it uses as much as digits as its factorization.

138698377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 52.

The square root of 138698377 is about 11777.0275112186. The cubic root of 138698377 is about 517.6351900842.

The spelling of 138698377 in words is "one hundred thirty-eight million, six hundred ninety-eight thousand, three hundred seventy-seven".