121918 has 8 divisors (see below), whose sum is σ = 186912. Its totient is φ = 59616.

The previous prime is 121909. The next prime is 121921. The reversal of 121918 is 819121.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555 + ... + 742.

It is an arithmetic number, because the mean of its divisors is an integer number (23364).

2¹²¹⁹¹⁸ is an apocalyptic number.

121918 is a deficient number, since it is larger than the sum of its proper divisors (64994).

121918 is a wasteful number, since it uses less digits than its factorization.

121918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346.

The product of its digits is 144, while the sum is 22.

The square root of 121918 is about 349.1675815422. The cubic root of 121918 is about 49.5856423063.

The spelling of 121918 in words is "one hundred twenty-one thousand, nine hundred eighteen".