100138 has 4 divisors (see below), whose sum is σ = 150210. Its totient is φ = 50068.

The previous prime is 100129. The next prime is 100151. The reversal of 100138 is 831001.

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

It can be written as a sum of positive squares in only one way, i.e., 76729 + 23409 = 277^2 + 153^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25033 + ... + 25036.

2¹⁰⁰¹³⁸ is an apocalyptic number.

100138 is a deficient number, since it is larger than the sum of its proper divisors (50072).

100138 is an equidigital number, since it uses as much as digits as its factorization.

100138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50071.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 100138 is about 316.4458879493. The cubic root of 100138 is about 46.4372298307.

Adding to 100138 its reverse (831001), we get a palindrome (931139).

The spelling of 100138 in words is "one hundred thousand, one hundred thirty-eight".