138487 has 4 divisors (see below), whose sum is σ = 140320. Its totient is φ = 136656.

The previous prime is 138469. The next prime is 138493. The reversal of 138487 is 784831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138487 is a prime.

It is a Duffinian number.

138487 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138407) 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 3 ways as a sum of consecutive naturals, for example, 798 + ... + 955.

It is an arithmetic number, because the mean of its divisors is an integer number (35080).

2¹³⁸⁴⁸⁷ is an apocalyptic number.

138487 is a deficient number, since it is larger than the sum of its proper divisors (1833).

138487 is an equidigital number, since it uses as much as digits as its factorization.

138487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832.

The product of its digits is 5376, while the sum is 31.

The square root of 138487 is about 372.1384151092. The cubic root of 138487 is about 51.7372096873.

It can be divided in two parts, 138 and 487, that added together give a 4-th power (625 = 5⁴).

The spelling of 138487 in words is "one hundred thirty-eight thousand, four hundred eighty-seven".