138178 has 8 divisors (see below), whose sum is σ = 210960. Its totient is φ = 67860.

The previous prime is 138163. The next prime is 138179. The reversal of 138178 is 871831.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (138179) 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, 468 + ... + 703.

It is an arithmetic number, because the mean of its divisors is an integer number (26370).

2¹³⁸¹⁷⁸ is an apocalyptic number.

138178 is a deficient number, since it is larger than the sum of its proper divisors (72782).

138178 is a wasteful number, since it uses less digits than its factorization.

138178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its digits is 1344, while the sum is 28.

The square root of 138178 is about 371.7230151605. The cubic root of 138178 is about 51.6987013730.

The spelling of 138178 in words is "one hundred thirty-eight thousand, one hundred seventy-eight".