155138123 has 8 divisors (see below), whose sum is σ = 178958592. Its totient is φ = 131732136.

The previous prime is 155138119. The next prime is 155138129. The reversal of 155138123 is 321831551.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 155138123 - 2² = 155138119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155138129) 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, 102815 + ... + 104312.

It is an arithmetic number, because the mean of its divisors is an integer number (22369824).

Almost surely, 2^155138123 is an apocalyptic number.

155138123 is a deficient number, since it is larger than the sum of its proper divisors (23820469).

155138123 is a wasteful number, since it uses less digits than its factorization.

155138123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207241.

The product of its digits is 3600, while the sum is 29.

The square root of 155138123 is about 12455.4455159179. The cubic root of 155138123 is about 537.3280479711.

Adding to 155138123 its reverse (321831551), we get a palindrome (476969674).

The spelling of 155138123 in words is "one hundred fifty-five million, one hundred thirty-eight thousand, one hundred twenty-three".