138578 has 8 divisors (see below), whose sum is σ = 226800. Its totient is φ = 62980.

The previous prime is 138577. The next prime is 138581. The reversal of 138578 is 875831.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3128 + ... + 3171.

It is an arithmetic number, because the mean of its divisors is an integer number (28350).

2¹³⁸⁵⁷⁸ is an apocalyptic number.

138578 is a deficient number, since it is larger than the sum of its proper divisors (88222).

138578 is a wasteful number, since it uses less digits than its factorization.

138578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6312.

The product of its digits is 6720, while the sum is 32.

The square root of 138578 is about 372.2606613651. The cubic root of 138578 is about 51.7485394035.

The spelling of 138578 in words is "one hundred thirty-eight thousand, five hundred seventy-eight".