138515 has 8 divisors (see below), whose sum is σ = 179088. Its totient is φ = 102240.

The previous prime is 138511. The next prime is 138517. The reversal of 138515 is 515831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138515 - 2² = 138511 is a prime.

It is a plaindrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (138511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1001 + ... + 1130.

It is an arithmetic number, because the mean of its divisors is an integer number (22386).

2¹³⁸⁵¹⁵ is an apocalyptic number.

138515 is a deficient number, since it is larger than the sum of its proper divisors (40573).

138515 is a wasteful number, since it uses less digits than its factorization.

138515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149.

The product of its digits is 600, while the sum is 23.

The square root of 138515 is about 372.1760336185. The cubic root of 138515 is about 51.7406962823.

The spelling of 138515 in words is "one hundred thirty-eight thousand, five hundred fifteen".