138379487 has 2 divisors, whose sum is σ = 138379488. Its totient is φ = 138379486.

The previous prime is 138379471. The next prime is 138379517. The reversal of 138379487 is 784973831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138379487 - 2⁴ = 138379471 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138370487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69189743 + 69189744.

It is an arithmetic number, because the mean of its divisors is an integer number (69189744).

Almost surely, 2^138379487 is an apocalyptic number.

138379487 is a deficient number, since it is larger than the sum of its proper divisors (1).

138379487 is an equidigital number, since it uses as much as digits as its factorization.

138379487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 50.

The square root of 138379487 is about 11763.4810749200. The cubic root of 138379487 is about 517.2381766567.

The spelling of 138379487 in words is "one hundred thirty-eight million, three hundred seventy-nine thousand, four hundred eighty-seven".