121538 has 8 divisors (see below), whose sum is σ = 185232. Its totient is φ = 59796.

The previous prime is 121531. The next prime is 121547. The reversal of 121538 is 835121.

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 (121531) by changing a digit.

121538 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320 + ... + 587.

It is an arithmetic number, because the mean of its divisors is an integer number (23154).

2¹²¹⁵³⁸ is an apocalyptic number.

121538 is a deficient number, since it is larger than the sum of its proper divisors (63694).

121538 is an equidigital number, since it uses as much as digits as its factorization.

121538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its digits is 240, while the sum is 20.

The square root of 121538 is about 348.6230055518. The cubic root of 121538 is about 49.5340717028.

Adding to 121538 its reverse (835121), we get a palindrome (956659).

The spelling of 121538 in words is "one hundred twenty-one thousand, five hundred thirty-eight".