138903487 has 2 divisors, whose sum is σ = 138903488. Its totient is φ = 138903486.

The previous prime is 138903473. The next prime is 138903491. The reversal of 138903487 is 784309831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138903487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138903437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69451743 + 69451744.

It is an arithmetic number, because the mean of its divisors is an integer number (69451744).

Almost surely, 2^138903487 is an apocalyptic number.

138903487 is a deficient number, since it is larger than the sum of its proper divisors (1).

138903487 is an equidigital number, since it uses as much as digits as its factorization.

138903487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 138903487 is about 11785.7323489039. The cubic root of 138903487 is about 517.8902275801.

The spelling of 138903487 in words is "one hundred thirty-eight million, nine hundred three thousand, four hundred eighty-seven".