121854 has 16 divisors (see below), whose sum is σ = 254592. Its totient is φ = 38808.

The previous prime is 121853. The next prime is 121867. The reversal of 121854 is 458121.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121853) 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, 304 + ... + 579.

It is an arithmetic number, because the mean of its divisors is an integer number (15912).

2¹²¹⁸⁵⁴ is an apocalyptic number.

121854 is an abundant number, since it is smaller than the sum of its proper divisors (132738).

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

121854 is a wasteful number, since it uses less digits than its factorization.

121854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911.

The product of its digits is 320, while the sum is 21.

The square root of 121854 is about 349.0759229738. The cubic root of 121854 is about 49.5769642424.

Adding to 121854 its reverse (458121), we get a palindrome (579975).

The spelling of 121854 in words is "one hundred twenty-one thousand, eight hundred fifty-four".