138513487 has 16 divisors (see below), whose sum is σ = 163897344. Its totient is φ = 114552000.

The previous prime is 138513469. The next prime is 138513503. The reversal of 138513487 is 784315831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138513487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138513437) 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 in 15 ways as a sum of consecutive naturals, for example, 92787 + ... + 94267.

It is an arithmetic number, because the mean of its divisors is an integer number (10243584).

Almost surely, 2^138513487 is an apocalyptic number.

138513487 is a deficient number, since it is larger than the sum of its proper divisors (25383857).

138513487 is a wasteful number, since it uses less digits than its factorization.

138513487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950.

The product of its digits is 80640, while the sum is 40.

The square root of 138513487 is about 11769.1752897134. The cubic root of 138513487 is about 517.4050789365.

The spelling of 138513487 in words is "one hundred thirty-eight million, five hundred thirteen thousand, four hundred eighty-seven".