121398 has 8 divisors (see below), whose sum is σ = 242808. Its totient is φ = 40464.

The previous prime is 121379. The next prime is 121403. The reversal of 121398 is 893121.

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

121398 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 121398.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10111 + ... + 10122.

It is an arithmetic number, because the mean of its divisors is an integer number (30351).

2¹²¹³⁹⁸ is an apocalyptic number.

121398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121398 is a wasteful number, since it uses less digits than its factorization.

121398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20238.

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

The square root of 121398 is about 348.4221577340. The cubic root of 121398 is about 49.5150449116.

The spelling of 121398 in words is "one hundred twenty-one thousand, three hundred ninety-eight".