121939 has 4 divisors (see below), whose sum is σ = 124000. Its totient is φ = 119880.

The previous prime is 121937. The next prime is 121949. The reversal of 121939 is 939121.

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

It is a cyclic number.

It is not a de Polignac number, because 121939 - 2¹ = 121937 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939 + ... + 1060.

It is an arithmetic number, because the mean of its divisors is an integer number (31000).

2¹²¹⁹³⁹ is an apocalyptic number.

121939 is a deficient number, since it is larger than the sum of its proper divisors (2061).

121939 is an equidigital number, since it uses as much as digits as its factorization.

121939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060.

The product of its digits is 486, while the sum is 25.

The square root of 121939 is about 349.1976517676. The cubic root of 121939 is about 49.5884891342.

The spelling of 121939 in words is "one hundred twenty-one thousand, nine hundred thirty-nine".