138432487 has 2 divisors, whose sum is σ = 138432488. Its totient is φ = 138432486.

The previous prime is 138432451. The next prime is 138432493. The reversal of 138432487 is 784234831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138432487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138432187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69216243 + 69216244.

It is an arithmetic number, because the mean of its divisors is an integer number (69216244).

Almost surely, 2^138432487 is an apocalyptic number.

138432487 is a deficient number, since it is larger than the sum of its proper divisors (1).

138432487 is an equidigital number, since it uses as much as digits as its factorization.

138432487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 40.

The square root of 138432487 is about 11765.7335937884. The cubic root of 138432487 is about 517.3042031198.

The spelling of 138432487 in words is "one hundred thirty-eight million, four hundred thirty-two thousand, four hundred eighty-seven".