155138 has 4 divisors (see below), whose sum is σ = 232710. Its totient is φ = 77568.

The previous prime is 155137. The next prime is 155153. The reversal of 155138 is 831551.

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., 134689 + 20449 = 367^2 + 143^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155138.

It is not an unprimeable number, because it can be changed into a prime (155137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38783 + ... + 38786.

2¹⁵⁵¹³⁸ is an apocalyptic number.

155138 is a deficient number, since it is larger than the sum of its proper divisors (77572).

155138 is an equidigital number, since it uses as much as digits as its factorization.

155138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77571.

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

The square root of 155138 is about 393.8756148837. The cubic root of 155138 is about 53.7327905966.

Adding to 155138 its reverse (831551), we get a palindrome (986689).

The spelling of 155138 in words is "one hundred fifty-five thousand, one hundred thirty-eight".