121839 has 8 divisors (see below), whose sum is σ = 172080. Its totient is φ = 76416.

The previous prime is 121789. The next prime is 121843. The reversal of 121839 is 938121.

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

It is not a de Polignac number, because 121839 - 2⁷ = 121711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121889) 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, 1144 + ... + 1245.

It is an arithmetic number, because the mean of its divisors is an integer number (21510).

2¹²¹⁸³⁹ is an apocalyptic number.

121839 is a deficient number, since it is larger than the sum of its proper divisors (50241).

121839 is a wasteful number, since it uses less digits than its factorization.

121839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2409.

The product of its digits is 432, while the sum is 24.

The square root of 121839 is about 349.0544370152. The cubic root of 121839 is about 49.5749298817.

The spelling of 121839 in words is "one hundred twenty-one thousand, eight hundred thirty-nine".